Cappadocia 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.
SubTropolis is a 55,000,000-square-foot (5,100,000 m2), 1,100-acre (4.5 km2) artificial cave in the bluffs above the Missouri River in Kansas City, Missouri, United States, that is claimed to be the world's largest underground storage facility.
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.
The first tunnel built whose engineer is known was excavated in the island of Samos. The engineer Eupalinos de Megara, built this tunnel in the 530 b.C to supply with water the capital of the island and was, with its 1 km length, considered as one of the three marvels of the helenic world.
The White House to Treasury Building tunnel is a 761-foot (232 m) subterranean structure in Washington, D.C. that connects a sub-basement of the East Wing of the White House to the areaway which surrounds the United States Treasury Building.