The unsealing of America’s oldest time capsule has granted us a surprisingly personal look into a defining moment in the nation's history. Locked away in the Massachusetts State House in Boston by Samuel Adams and Paul Revere, the capsule (which had been opened earlier, in 1855) contained relics such as coins, newspaper clippings, and a medal honoring George Washington. Its unearthing sparked renewed interest in the age-old concept of preserving a historical snapshot for the generations to come.
10. Bellevue Hospital Medical College

In 2011, as New York University was tearing down the Bellevue Hospital Medical College building, they stumbled upon a long-forgotten time capsule. Placed within the building's cornerstone in 1897, it was opened by a bacteriologist from NYU, who discovered a vial of bacterial spores, carefully prepared for him 114 years earlier.
The capsule was assembled by Bellevue Hospital Medical College bacteriologist Edward Dunham, who included the vial along with more conventional time capsule items such as student medical records. The sample had been taken from a 23-year-old patient at the hospital, and Dunham left it with a note, hoping that whoever discovered the capsule would gain valuable insights into the longevity of bacteria.
The potential significance of the sample is immense. Since the widespread use of antibiotics began in the 1940s, bacteria have evolved drastically, and the sample offers researchers a glimpse into the bacterial landscape before we understood how to combat it. It provides an opportunity to trace how bacteria has transformed over the years and how the ability to go dormant has allowed bacteria to endure across decades.
9. The National Zoo

While the elephant house at the National Zoo in Washington, D.C. was undergoing renovations, workers uncovered a time capsule left behind by a historic figure in the zoo’s legacy. William Mann, a former zoo director, began his extraordinary career at the age of nine when he ran away to join the circus with the ambition of teaching them better animal care. During his tenure at the zoo, Mann authored numerous works on animal welfare, established the first full-time veterinary department, and even trained one of the zoo’s birds to inquire about the status of their government funding.
Mann’s time capsule included programs from the Ringling Brothers and Barnum & Bailey Circus, a copy of the Washington Post, and documents about the zoo’s resident elephants at the time.
Inspired by Mann’s time capsule, the current caretakers of the elephant house will assemble their own time capsule to place inside the newly renovated building. They plan to include details about their elephants and the endangered status of elephants in the wild—and, just like Mann, they’ll also be adding a copy of the Washington Post.
8. The Future Library

This time capsule is particularly unique because it won’t be fully assembled for quite some time. The Future Library project is a century-long initiative that will feature 100 writers, one each year, contributing an original work to be sealed within the Future Library, where it will remain unread until 2114. When that day arrives, a special anthology will be printed on paper made from a forest of 1,000 trees recently planted in Norway. Until the moment of revelation, the manuscripts will be stored at the New Deichmanske Public Library in Oslo.
Margaret Atwood was the first author selected and will present her unpublished manuscript to the library in 2015. The entire initiative is the creation of a Scottish artist named Katie Paterson, who will collaborate with a literary trust to choose the authors as long as she is able. The only requirement for the works is that they should be centered around themes of time and imagination—beyond that, each writer has complete freedom to explore their own ideas.
In the grand scheme of things, 100 years might not seem so distant. However, according to Paterson, the concept is that each author isn’t writing for an anonymous audience in an unreachably far-off future, but for one that feels just out of grasp.
7. Lunar Mission One

Leaving a time capsule in the cornerstone of a building or inside a vault somewhere is one thing, but there’s something truly monumental about the idea of leaving one on the Moon.
Lunar Mission One, set to launch in 2024, has a relatively traditional objective—it plans to land on the Moon's southern pole and gather surface layer samples. However, it will also leave a time capsule behind. Part of the capsule will contain details about Earth and its history, as well as any personal items the project's supporters wish to preserve on the Moon. Suggested inclusions are photos, family trees, and even strands of hair (for DNA purposes).
According to the creators of the project, the capsule serves not only as an opportunity to spark interest in space but also as an emotional journey. While our lives may seem fleeting or inconsequential, the idea of being one of the few individuals immortalized in a time capsule on the Moon is undeniably fascinating.
6. The Apollo 11 Recordings

Few moments in modern history capture the imagination like the Apollo 11 Moon landing. To ensure it was preserved for future generations, every aspect of the landing was recorded, from astronaut conversations to communications between the shuttle and NASA's ground crew. On the 40th anniversary of Neil Armstrong’s first steps on the lunar surface, NASA honored everyone involved in the mission by creating an ‘audio time capsule’ containing all the recordings.
Starting in the early morning of July 16, 2009, NASA began live-streaming the audio feed of the mission in real time, exactly as it was broadcast 40 years earlier. The stream lasted eight days, beginning a few hours before the shuttle launched and continuing until after the crew had landed.
Interestingly, during the actual Moon landing, NASA was unable to hear the conversations taking place inside the Lunar Module, but all of them were recorded and retrieved after the mission. While transcripts have been available for some time, it’s only relatively recently that the files were digitized and made accessible online. Originally, the recordings were made using onboard voice recorders and stored somewhat haphazardly on tapes.
5. The Environmental Specimen Banks

The International Environmental Specimen Bank Group is a global alliance aimed at preserving environmental and biological data for future research. Countries such as Sweden, Japan, Norway, Italy, the United States, and Canada have already implemented protocols for collecting and conserving samples for future use, with additional nations working on similar strategies.
The range of samples within this international collection is vast. Germany’s environmental specimen bank holds a wide array of samples, including blood plasma and human hair, zebra and blue mussels, roe deer organs, pigeon eggs, and soil samples. These environmental time capsules serve a very practical purpose—by monitoring the changes in these samples over time, we can clearly observe the effects of human activity on the environment and understand how the environment is influencing us. The specimen banks also enable researchers to track the effectiveness of green initiatives, study the long-term impacts of chemical use, and assess whether environmental policies are achieving their intended outcomes.
The process of obtaining, documenting, and storing samples is a thorough one, with strict protocols in place. For example, 15 percent of the samples collected in any given year must be stored at a secondary location.
4. The Mantin Mansion

Louis Mantin was born in Moulins, France, in 1851. A civil servant, he inherited a substantial fortune from his father, which he used to amass a collection of fine furniture and modern conveniences such as early electrical appliances. He also had an interest in the historical, acquiring Masonic memorabilia, Neolithic tools and oil lamps, and even a selection of medieval locks and keys.
Mantin never married and had no children, so in his will, he requested that his home be preserved for 100 years and eventually turned into a museum—and that’s exactly what occurred. Upon his death, the people of Moulins sealed the house, only reopening it at the designated time, prompted by one of Mantin’s last remaining relatives.
In fact, it took 105 years, as Mantin passed away in 1905 and his museum finally opened in 2010. The house required some renovations to return it to its original pristine condition, but once completed, the result was a remarkable window into daily life from a century ago. While Martin’s collection of Egyptian artifacts, imported porcelain, and tapestries were impressive, the rooms that were once intended for his personal use have become equally priceless.
3. The Rosetta Project

Named after the Rosetta Stone, the Rosetta Project is part of The Long Now Foundation, an organization founded in 1996 with the goal of encouraging long-term thinking—not just within our lifetimes, but for the next 10,000 years.
The Rosetta Project was one of their earliest initiatives, ensuring that a vast array of languages will be preserved—and that any texts written in these languages can be understood should they be uncovered thousands of years from now.
The initial phase of the project involved assembling a set of texts that are essentially identical, but translated into 1,000 different languages. They’ve already surpassed this goal, amassing 100,000 pages of text in 2,500 different languages. This is an immensely important project, especially since linguists predict that as much as 90 percent of the world’s languages could disappear in the next century.
The second phase of the initiative involves a long-term archive known as the Rosetta Disk. Currently in prototype form, this archive is a 7.5 cm (3 in) metal disk that holds a vast array of information—from entire works of literature to blueprints of groundbreaking technologies. Unlike digital media, the information is not stored in a conventional manner; instead, it is microscopically etched into the disk's surface. Future generations would only need an advanced microscope to decode the 14,000 pages of content.
2. MIT’s Various Efforts with Time Capsules

As one of America's premier research institutions, the Massachusetts Institute of Technology (MIT) has undertaken numerous ambitious endeavors involving time capsules. For instance, MIT and its students are crowd-sourcing funds to send a time capsule to Mars. This project involves a propulsion system designed at MIT, based on a technology currently used aboard the International Space Station. The goal is to create an engine capable of transmitting millions of messages, all stored in a quartz unit, to Mars within a few months. This would ensure that humans will have something awaiting us once we eventually colonize the planet.
Hopefully, this new time capsule project will fare better than some of MIT’s past attempts. One time capsule placed on campus was meant to be opened in 1989, 30 years after its installation. However, it still remains unopened, primarily because an 18-ton particle accelerator was built on top of it. Though the accelerator is no longer in use, no one has yet made an effort to move it and see what’s inside the capsule.
This may be due to their familiarity with the sense of humor of Harold Edgerton, an MIT electrical engineering professor and avid time capsule creator. In 1957, Edgerton designed and sealed his own time capsule, ensuring the contents would remain unharmed during the 1,000 years it was meant to stay sealed.
What could possibly be inside that would give future generations a genuine glimpse of life in 1957, in a world that has undergone centuries of transformation?
An empty bottle, a coffee mug, and 91 cents.
1. The Detroit Time Capsule

In 1901, Detroit’s mayor, William Maybury, oversaw the creation of a time capsule that was set to remain sealed for a century. When the capsule was finally opened in 2001, the letters inside revealed a surprising mixture of boundless optimism, heartfelt memories, and a sense of melancholy.
Today, we understand that Detroit has experienced more prosperous times, which is what makes the contents of the capsule so poignant. Maybury had asked several prominent Detroit figures to compile statistics about the city at the turn of the 20th century and to make predictions about what the future would hold.
James Scripps, president of the Evening News Association, compared Detroit to an American version of Constantinople, believing its prime location and wealth of natural resources would make it one of the best and most desirable places to live in the country. He foresaw Detroit being the healthiest city in 2001, with a thriving seaport, a bustling industrial center, a hub of entertainment, and a population exceeding two million.
Orrin R. Baldwin, president of the Merchants and Manufacturers Exchange and the American Harrow Company, predicted that Detroit would be a manufacturing giant, boasting over 5,000 factories and employing 500,000 people, with the broader city housing 2.5 million residents.
Maybury himself made some broad predictions, such as advancements in travel and communication that would allow people to easily connect with others across the globe.
