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The twin forces of archaeology—mystery and discovery—make it one of the most enthralling fields of exploration. Ancient buildings are especially intriguing—the greater the discovery, the more thrilling the find.
A single, unique artifact is precious, but vast temple complexes, hidden geoglyphs, and monumental castles breathe new life into history. These constructions can reveal the fears, ambitions, or societal aspects of their creators. However, the most captivating mysteries often lie within unexpected structures—some discovered in large quantities or within well-explored sites—whose true purpose remains an unsolved riddle.
10. The Gegharot Occult Hub
In a turbulent period of Armenia's history, a community turned to divination to glimpse the future. Between 2003 and 2011, archaeologists unearthed three shrines within a fortress at Gegharot.
Over 3,300 years old, each shrine contained a room with a clay basin. Artifacts suggested that three distinct forms of divination were once practiced at Gegharot. A large collection of knucklebones from cattle, goats, and sheep were discovered, scorched and marked. These were likely used in osteomancy—the practice of casting and interpreting bones based on their landing positions.
Signs of lithomancy, the use of stones instead of bones, were also present. Perhaps the most unusual method involved using flour to predict the future. Officially called aleuromancy, this may have taken place in the eastern shrine. Tools for grinding grain were found, but no oven. The room's basin showed signs of burning and could have been used to bake small loaves, which were then imprinted with images from stamp seals found inside.
Despite the efforts of the people of Gegharot to seek answers through divination, they found no protection. Gegharot, along with every other fortress in the area, was destroyed during a major conflict.
9. Sunken Castle
Tahsin Ceylan was determined to find the monster said to dwell in the depths of Turkey's Lake Van. Despite hearing rumors of submerged ruins, experts advised him against pursuing the idea. According to scholars, the second-largest lake in the Middle East held no secrets beneath its waters.
Undeterred, Ceylan and his team pressed forward. After ten years, while no monster emerged, they uncovered the remnants of a lost city. In 2016, they unearthed 1,000-year-old tombstones and stalagmites forming a square pattern, stretching around 4 kilometers (2.5 miles).
By early 2017, they discovered a Russian shipwreck that had sunk seven decades prior. However, the real breakthrough came later that year. Deep beneath the surface, they uncovered a castle built with large, angular blocks. Spanning about 1 kilometer (0.6 miles) along the lakebed, the structure's walls stood 3-4 meters (10-13 feet) tall, astonishingly well-preserved despite being 3,000 years old.
The castle is believed to have been constructed by the ancient Urartu civilization, also known as the Kingdom of Van. During its reign (ninth to sixth centuries BC), the lake was at a lower level. Over time, the water rose and eventually submerged the castle.
8. The Palpa Orca
In the Palpa desert of Peru, the earth is adorned with thousands of ancient geoglyphs. However, one had gone missing. German archaeologists had documented a killer whale in the 1960s, but they failed to accurately note its location. Lost for over fifty years, Peru’s Ministry of Culture became aware of the orca's existence after discovering a geoglyph catalog at a German institute.
After years of searching via Google Earth and exploring the hills of Palpa Valley, archaeologists finally located the geoglyph in 2015. Carved into a hillside, the orca measured 70 meters (230 feet) long. Erosion had significantly worn away the details, but restoration efforts in 2017 helped reveal it in much better condition.
Remarkably, tests at the site indicated that the geoglyph was over 2,000 years old, predating the renowned Nazca lines in the nearby region. Much like the Nazca art, the orca was created by clearing away stones to form the outline. The creators belonged to the Paracas culture (800–200 BC), which predated the Nazca civilization.
The exact reason why both civilizations chose to cover more than 450 square kilometers (174 miles) with vast geoglyphs remains a mystery.
7. Steppe Geoglyphs
In 2007, Dmitriy Dey from Kazakhstan watched a documentary about pyramids. Fascinated, he turned to Google Earth to see if any pyramids existed in his country. He found none, but what he did find were over 260 man-made structures, some of which were enormous. The largest of these, an intricate square design, was even bigger than the base of the Great Pyramid of Cheops.
As Dey's discovery made headlines, experts were initially doubtful, fearing it could be a hoax. However, NASA captured satellite images, confirming the existence of these mysterious shapes. When seen from the ground, the earthworks appeared confusing. But from above, massive crosses, squares, lines, rings, and mounds dotted the steppe. The remarkable collection also featured trenches and ramparts.
The architects behind these constructions were undoubtedly skilled, altering how experts view Neolithic nomads. Building these structures demanded large numbers of people, immense effort, and a commitment to staying in one place—all traits typically not associated with nomadic cultures.
The purpose and age of these ancient structures remain a mystery. The Mahandzhar culture (7000–5000 BC), known for its residents, may be connected to the earliest buildings at the site. One of the mounds has been dated to 800 BC, possibly indicating a long-lasting effort across generations.
6. Pyramid in Nazca
The mud city of Cahuachi once served as the hub for the Nazca people in Peru, abandoned sometime between AD 300 and 350. Before they left, the monuments were buried under the desert sands. Approximately 40 mounds exist in Cahuachi. In earlier years, their materials interfered with scanning technology, as the adobe structures (sun-hardened soil) blended too seamlessly with the surrounding earth, rendering the scans ineffective.
A satellite recently made its first successful separation of the two structures while scanning a site near the city. The resulting images revealed an adobe pyramid that covered 9,000 square meters (97,000 ft). The pyramid's base stretched 91 meters (300 ft) by 100 meters (328 ft), with heavy walls and seven levels amplifying its impressive stature.
The newly discovered pyramid resembled another structure found within Cahuachi, the colossal asymmetrical Grand Pyramid. During past excavations, anthropologists uncovered human skulls arranged within the Grand Pyramid, each meticulously positioned as a ceremonial offering. Given the resemblance between the two pyramids, it is highly probable that the newly discovered pyramid also contains evidence of human sacrifice.
5. Singleton’s Lost Castle
Several years ago, The National Trust acquired a wooded area in Northern Ireland, part of the Mount Stewart estate in County Down. Archaeologists used radar to probe the ground, and one promising spot stood out. An aerial photograph revealed a circular structure below the trees. However, accessing the site required more than 800 hours of tree-clearing efforts.
By 2017, enough of the ground had been cleared to expose what had previously been captured in the photograph. It revealed a Norman-era castle built eight centuries ago on the Ards peninsula of the estate. At least one individual associated with the castle has been identified—a Norman named Robert de Singleton, who resided there in 1333.
The well-preserved structure dates back to the 12th century and follows the military motte-and-bailey design. The mound (motte), where the castle stood, measured 23 meters (75 ft) in diameter. The bailey, another key feature, was a large ditch that once enclosed the entire area, with a palisade likely surrounding it in the past.
4. Nero’s Vanity Project
Archaeologists have been intrigued by Silchester since Victorian times. Previous excavations revealed two Roman temples on a farm, but the exact connection between Silchester and Rome remained an unsolved mystery.
When archaeologists returned in 2017, they uncovered valuable clues about how Emperor Nero (r. AD 54–68) wanted to be perceived by the local population. They discovered the remains of a third temple and found tiles inside engraved with Nero’s name. This confirmed that the new discovery was indeed a unique Roman temple in Britain from the time of Nero.
Although the tiles may seem ordinary, they are incredibly rare in the UK. Finding seven tiles at Silchester supports the theory that Nero himself commissioned the construction. These temples were quite remarkable for their era.
At that time, Silchester was known as the Roman city of Calleva, and the temples were among the first monumental buildings, predating all other structures by several decades. The temples stood around 15 meters (50 ft) tall, with foundations averaging 15 meters (50 ft) by 17 meters (55 ft). It is believed that Nero built these grand structures at Calleva to impress the local population.
3. The Great Pyramid Void
In a groundbreaking 2017 announcement, scientists revealed that they had discovered a massive void within the Great Pyramid of Giza. No significant discoveries had been made in this iconic Egyptian structure since the 1800s. The cavity stretches nearly 30 meters (100 ft) in length above the Grand Gallery, the pyramid's main passageway.
In 2015, Egyptologists employed a noninvasive technique known as muon radiography. Muons are cosmic particles that continuously pass through all matter on Earth. By measuring the speed of the muons—fast through empty spaces, slow through solid objects—scientists can reconstruct the internal structure of a building.
Muon detectors were placed inside the pyramid for several months. When the data was analyzed in 2016, the discovery of the void left scientists in awe. The muons revealed that the cavity's cross-section aligned with the Grand Gallery. Unlike the gallery, which leads to the tomb of Pharaoh Khufu (r. 2509–2483 BC), the void appeared to be sealed off.
Muon technology provides only a partial view of the void. It remains unclear what lies inside, why it was incorporated into the 4,500-year-old monument, or if it is the result of multiple structures combined. One hypothesis suggests that the void could be the remains of a decommissioned construction ramp.
2. The Saudi Gates
In a world where most new discoveries are confined to individual sites or artifacts, the Saudi gates stand out as an exception. Discovered via satellite in 2017, roughly 400 megalithic structures stretch across west-central Saudi Arabia. While not true doorways, from an aerial view, many of them resemble ancient field gates.
The gates are entirely man-made. Someone invested significant effort into constructing these stone walls, with some stretching the length of a football field. A few feature multiple walls, while others take on rectangular shapes. Some of the simpler walls have stones stacked at each end.
It’s clear the structures served a specific function, though their exact purpose remains a mystery. The age of the gates is also unknown. Archaeologists who tried to estimate their age discovered that certain formations sat atop the earliest levels of reconstruction and lava flows. Later structures, like hunting traps or 'kites' and circular formations called wheels, were built on top of these ancient ruins.
No man-made buildings were found beneath the gates, making them the oldest structures in the area. While more research is needed, some of these gates could date back as far as 7,000 years.
1. Theater Under Jerusalem’s Wall
In 2017, an excavation in Jerusalem sought to determine the age of Wilson’s Arch, a stone bridge that curved toward the Temple Mount. As the dig expanded toward the famous Western Wall, the team made a groundbreaking discovery.
To the surprise of the archaeologists, they uncovered an enclosed space that shifted their focus entirely away from the bridge. It turned out to be a small but well-preserved theater, capable of seating around 200 people. This was also the first example of public Roman architecture ever found in the city.
While its exact purpose may never be fully understood, the theater was likely used as a musical hall or a venue for gatherings. Tests indicated the building was constructed during the second century AD.
During this era, Rome had control over Jerusalem and showed little tolerance toward the Jewish population, who were ultimately expelled. This turbulent period might explain the unfinished nature of the theater. Some staircases were left uncarved, and certain stone blocks were marked for cutting but were never completed.
Researchers speculate that the resources—both labor and finances—intended for the theater’s construction may have been redirected to suppress the Jewish revolt known as the Bar Kokhba Revolt.
