The ancient city of Elengubu, known today as Derinkuyu, burrows more than 85m below the Earth's surface, encompassing 18 levels of tunnels.
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Butte underground city, MontanaThese are well-preserved relics from the early 20th century, when mining was at its height and the population swelled to around 100,000. Space was at a premium so people started using underground areas connected by tunnels. Today, you can usually visit on a subterranean tour.
The largest underground city in the United States is the SubTropolis, which is an artificial cave located just above the Missouri River in Kansas City, Missouri. This underground city is 5,100,000 square meters and sits on a 1,100-acre piece of land with limestone deposits dating back to 270 million years ago.
Some cities are so top-secret they can't even be found on a map.Others are padlocked, hidden in the forest, or buried deep underground. From Poland's 800-year-old Wieliczka Salt Mines to America's WWII mystery towns, SPYSCAPE explores some of the world's most intriguing secret cities.
Within the city, too, the tunnels are deeply buried—for instance, 500 feet below the streets of Manhattan's West Side—because it is easier to connect to the water mains with vertical risers than to go wandering around through all the complications that lie closer to the surface.
Detroit-Windsor TunnelIt is the third oldest underwater vehicle tunnel in the United States or Canada. It stands behind only New York/New Jersey's Hudson River-crossing Holland Tunnel (completed in 1927) and the Posey Tube (completed in 1928), which connects Alameda and Oakland, California.