Derinkuyu, Cappadocia, TurkeyCappadocia city, located in central Turkey, is home to no less than 36 underground cities, and at a depth of approx. 85 m, Derinkuyu is the deepest.
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Oklahoma City, Oklahoma: the Oklahoma City Underground (formerly the Oklahoma City Conncourse) is a tunnel system connecting nearly all of the downtown buildings in a 20-square-block area.
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.
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 Union Canal Tunnel is the oldest existing transportation tunnel in the United States. According to oral history, George Washington visited the canal diggings in 1792, and then again in 1794, while he was accompanying troops to suppress the Whiskey Rebellion in Western Pennsylvania.
Dingess Tunnel has been called “America's Bloodiest Tunnel” due to stories from the late 1800s/early 1900s of immigrant and African-American coal miners and railroad employees being murdered while traveling through the tunnel (Appalachian Magazine, 2014.)
The Twin Bores15, 1968, and was completed five years later on Mar. 8, 1973. The Eisenhower Tunnel celebrates a big milestone of Connecting Colorado for 50 Years as of March 8, 2023. This bore was originally called the Straight Creek Tunnel, and later was officially named the Eisenhower Memorial Bore.
Both the cavernous subway tunnel underneath Boston's City Hall Plaza and the abandoned trolley passages below Washington, D.C.'s Dupont Circle were decommisioned in the 1960s. Los Angeles also has its own extensive network of abandoned tunnels, including its first subway, the Red Line downtown.
The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.
It's the lone tunnel that goes under water in Virginia, although there are several other bridge tunnels in the state. And while you won't be able to ogle marine life from your car window on your drive... rest assured you are indeed well below the surface!