Buzz
The aftermath of World War II (1939–1945) left behind a multitude of battlefields, concentration camps, and relics. Beneath this familiar historical narrative lies a fascinating world of concealed treasures and places. Some were lost to the passage of time, others kept hidden intentionally, while some were buried by desperate hands. From a multi-billion dollar treasure trove to the terrifying secrets of Unit 731, here are some of the most carefully hidden discoveries that provided us with a deeper understanding of WWII.
10. A Map That Led to a Ban
In 1944, as the Germans advanced on the Dutch city of Arnhem, four German soldiers robbed a bank, making off with precious stones, coins, and jewelry worth millions today. A year later, the same men remained in the Netherlands. As the Allies closed in, they buried the loot in the village of Ommeren.
One of the soldiers drew a map to assist in retrieving the treasure at a later time. Somehow, the map ended up in the Dutch National Archives. It was only released to the public in 2023, but despite official efforts, the treasure remains lost. Clues exist: the treasure was buried in bread packages and ammunition boxes, about two feet (0.6 m) underground. The location is described as 'under the shade of a poplar tree.' However, the poplar tree is no longer there, and its former location is now anyone's guess.
This didn’t stop unauthorized metal detector enthusiasts from combing the entire town. Eventually, Ommeren had to impose a ban. The ban wasn’t just due to the annoyance it caused the residents, but also because of the risk that someone might unintentionally trigger buried WWII explosives.
9. An Irish Message for Pilots
Not every country entered the conflict of WWII. Ireland chose to remain neutral. However, concerned that bombers might mistakenly target them, the Irish devised a clever solution. In the summer of 1944, they gathered 150 tons (136 metric tons) of stones and arranged them to spell the word “EIRE” in large, whitewashed letters, visible from the air. The word, which means “Ireland” in the Irish language, served as a reminder to bombers that they were flying over neutral territory.
In 2018, wildfires ravaged County Wicklow. The fire cleared enough underbrush to uncover a previously hidden “EIRE” in Bray. Ironically, it was first discovered by a police helicopter flying over the area after the fire had passed. Above the sign was a faint number 8, indicating the location of a now-vanished lookout post. Each sign, about 83 in total along the Irish coast, was accompanied by a post that was manned around the clock to guard against a potential German invasion.
8. A Rare German Wall Stash
In 2021, severe flooding devastated a woman’s house in Hagen, Germany. While cleaning the place and removing damaged plasterboard, a family member stumbled upon a hidden compartment in the wall. Inside, they found an assortment of items including documents, a revolver, gas masks, brass knuckles, letters, Nazi Party badges, a portrait of Adolf Hitler, and a newspaper dated 1945.
It turned out to be an incredibly rare discovery. Toward the end of the war, many Germans quickly concealed sensitive materials as Allied forces approached their cities. Yet, it’s quite uncommon to uncover a stash in such pristine condition as this one.
Upon further investigation, researchers found that during WWII, the house had served as the local headquarters for an organization called the National Socialist People’s Welfare (NSV). This organization, known for running kindergartens and relief operations, may have played a significant role in the Nazi regime. The 12 boxes of materials might shed light on this connection.
7. The Lost Story of a Count’s Death
In 2017, a teenager exploring Lake Zeziorak in Poland discovered old milk cans buried in the ground. Inside the cans were personal belongings, valuables, documents, and a German officer’s uniform. Authorities identified the owner as an aristocratic Prussian, Count Hans Joachim von Finckenstein.
During the war, his family resided by the lake when the area was part of Germany. Some details about their fate became clearer when researchers located the count’s daughter, Waldtraut, now 81 years old. She shared that she and her sister were sent away before the Russian invasion, while their parents remained behind. The count was arrested by Soviet soldiers in 1945 and later perished in a prisoner camp. His wife, believed to have hidden the family heirlooms, was eventually reunited with her children in Germany.
Curiously, one of the notes found in the hidden cache implies that things didn’t immediately take a turn for the worse for the count and his wife. Written by a Soviet officer, the note read, “Comrades and soldiers, please do not harm the inhabitants of this house. They welcomed us.” It remains unclear why this plea didn’t prevent the count’s arrest.
6. Bunker for Churchill’s “Secret Army”
Winston Churchill organized a covert army of auxiliary units as Britain’s last line of defense against a potential German invasion. These specialized soldiers were selected for their local knowledge and trained in sabotage and assassination tactics. Their mission involved launching surprise attacks, so approximately 500 bunkers were constructed where they could remain hidden until needed. Fortunately for both sides, Britain was never invaded during WWII.
Today, these bunkers are incredibly rare to find. The builders had signed the Official Secrets Act, which prohibited them from discussing their work. With no one able to talk about it, the locations of most bunkers faded into obscurity over time.
In 2020, a team of researchers from Forestry and Land Scotland were assigned to survey historical sites before a tree-felling operation. Remarkably, one team member recalled discovering one of these bunkers during his childhood play in the forest over 40 years ago. Using nothing but his memory, the team located the underground shelter, which measured around 23 feet (7 meters) long and 10 feet (3 meters) wide. Due to its historical significance, the exact location will remain confidential for now.
5. An Enigma Machine
The Allies confronted a formidable enemy device—a typewriter. But not just any typewriter. The Germans used the notorious Enigma machine to send encrypted messages that were thought to be unbreakable. The tale of how Polish and British codebreakers managed to crack the cipher, ultimately shortening the war by several years, has become one of the most legendary stories of WWII.
Today, Enigma machines are extremely rare. In 2020, a dive team wasn’t expecting to find anything of historical value when they geared up and dived into the Baltic Sea. Their primary mission was environmental—to remove abandoned fishing nets from the Bay of Gelting near Germany. After retrieving a net, one diver noticed a rusty typewriter tangled within it. To their astonishment, this “junk” turned out to be a legendary Enigma machine.
The device had likely been discarded from a German warship near the end of the war. After spending decades submerged in seawater, the machine underwent a year-long restoration before being displayed in a museum.
4. A Village Secret
It’s uncommon for an entire village to conceal a secret from outsiders. Yet, during WWII, the Cornish village of St. Erth did just that. The residents kept quiet about their village’s role in hosting an M16 outstation, which secretly intercepted German radio communications. The station, consisting of around 100 members, was so discreet that one of them, Harry Griffiths, left his codebook to his son, Mike, upon his death.
Mike later wrote a book about the station’s crucial contribution to the war. Strategically placed, the station enjoyed unfettered radio waves that allowed it to track U-boats deep into the Atlantic. The radio operators intercepted German transmissions, which were then sent to the codebreakers at Bletchley Park (famous for its work on the Enigma machine). The station’s intelligence helped create such a detailed understanding of the German war effort that German officers, when interrogated after the war, were shocked at how much the British already knew.
Today, the only remnants of the St. Erth listening station are an old guard hut and a decaying gate.
3. Unit 731
Unit 731 occupies a dark and infamous chapter in history. Operated by the Japanese military, the unit was responsible for the deaths of up to 12,000 men, women, and children, conducting gruesome experiments like live ‘autopsies’ without anesthesia and exposing victims to lethal biological and chemical agents. The unit also caused the death of hundreds of thousands more by breeding plague-infested fleas and releasing them over Chinese cities.
Despite its notoriety, the location of this hideout had been lost for years. Records indicated it was built in China in 1941, during Japan’s occupation, and that it was shut down near the end of WWII. However, recent archaeological excavations in the city of Anda led Chinese researchers to uncover an underground structure, which they believe is the infamous Unit 731.
The structure’s design adds weight to this theory. As Japan’s largest biological warfare testing site, the newly discovered bunker contains an intricate web of rooms and tunnels, stretching approximately 108 feet (33 meters) long and 67 feet (21 meters) wide. Some of the rooms appear to have been laboratories, holding cells, dissection areas, viewing rooms, and barracks.
2. The YIVO Library
During WWII, the German forces exterminated nearly 95% of Lithuania’s Jewish population. Their rich religious and cultural heritage, including treasured archives, wasn’t spared. One notable site, the city of Vilna, often called the “Jerusalem of Lithuania,” was home to the Yiddish Scientific Institute (YIVO). Here, an invaluable collection of Jewish history, Yiddish language research, literature, and folklore was amassed.
When the Germans seized the YIVO headquarters in Vilna, 40 Jewish scholars were ordered to destroy 70% of their library. They were instructed to select a small group of documents, which their captors would transport to a future museum in Frankfurt. Despite constant supervision by Nazis, these courageous scholars managed to strap the documents to their bodies and secretly hide them in the city’s ghetto, where all Jews were confined.
Years later, some of the hidden documents were rediscovered. Between 1989 and 1991, around 250,000 pages were retrieved from a church basement in Vilna. A second cache of 170,000 pages was found in 2016 in a different room. Many scholars today consider these materials among the most significant Jewish archives ever discovered, rivaling the Dead Sea Scrolls.
1. The Michaelis Diary
Unlike most diaries, this one is far from mundane—it seems to point toward treasure worth billions. The diary is believed to have been written by an SS officer using the pseudonym 'Michaelis'. It details Nazi commander Heinrich Himmler’s plans to secretly stash the vast wealth Germany had stolen across Europe.
For decades, the diary was kept hidden by a Masonic lodge in the town of Quedlinburg, Germany. Why? It was said that 'Michaelis' was a member of the lodge, and for many years, the secret society included descendants of elite Nazi officials. In 2019, the diary was finally uncovered when the lodge gave it to Poland as an apology for WWII.
Though the book was penned during the war, it remains uncertain whether the tale of the treasure is genuine. The author provides 11 potential locations where priceless riches are hidden, and one of them may hold the key to the truth. Among these is a rumored abandoned well beneath the 16th-century Hochberg Palace in Poland, said to contain over 30 tons (28 metric tons) of gold. The palace owners are planning renovations, and part of the restoration will involve searching for the hidden well.
