There are several examples of underground cities around the world, ranging from ancient underground settlements to modern-day underground transportation systems. Here are some examples:
- Derinkuyu, Turkey: Derinkuyu is the largest underground city in the world, located in the heart of Cappadocia. It was built to meet the needs of the people who lived there, and it was used and expanded over the years. The city has 11 levels of depth, with houses, stables, wine cellars, and places of worship.
- Seattle, Washington: Seattle is one of the American towns with an underground city. It was built after a fire destroyed much of the city in 1889, and the new city was built on top of the old one. The underground city is now a popular tourist attraction.
- San Francisco, California: San Francisco also has an underground city, which was built after the 1906 earthquake and fire. The city was rebuilt on top of the old one, and the underground city is now a network of tunnels and abandoned buildings.
- Washington, DC: Washington, DC has an extensive underground transportation system, including the Metro subway system. The system covers a vast network of lines and stations, providing efficient and reliable transportation for the city's residents and visitors.
- Montreal, Canada: Montreal has an extensive underground city known as RÉSO, which is a network of tunnels and buildings that connect the city's major attractions, shopping centers, and transportation hubs.
- Helsinki, Finland: Helsinki has an underground city known as Helsingfors underjordiska, which is a network of tunnels and buildings that connect the city's major attractions, shopping centers, and transportation hubs.
These examples demonstrate the various types of underground cities around the world, from ancient settlements to modern transportation systems. While moving entire cities and towns underground may not be feasible or necessary, these examples show how underground spaces can be used for a variety of purposes, including transportation, shelter, and storage.