Some of the world’s most surprising places are not on a skyline. They are underfoot.
Across Europe, the Middle East, and beyond, underground cities helped people survive war, weather, religion-based persecution, and daily life in harsh landscapes. Many are open to visitors today, but most remain far less famous than the major landmarks above them.
Derinkuyu, Turkey
Derinkuyu, in central Turkey’s Cappadocia region, is often described as the deepest excavated underground city in the world. Archaeologists say it reaches about 85 meters deep and includes multiple levels carved from soft volcanic rock. Local tourism officials say the complex could have sheltered as many as 20,000 people along with livestock and food stores.
The site was likely expanded over centuries, with major use during the Byzantine era. Historians say underground refuge became crucial when communities faced raids and regional instability. Heavy circular stone doors, narrow corridors, and ventilation shafts show that defense and long stays were planned into the design.
Visitors today can see stables, storage rooms, chapels, and communal spaces. Only part of the city is open to the public, which means much of it still remains out of sight. That scale is one reason Derinkuyu keeps drawing new attention even among travelers who think they already know Cappadocia.
Kaymakli, Turkey
Not far from Derinkuyu, Kaymakli offers a different look at underground life in Cappadocia. It is wider and more spread out than some neighboring sites, with low passageways connecting rooms used for cooking, storage, and worship. Turkish cultural authorities have said the city contains at least eight levels, though only a few are routinely accessible.
Unlike a single shelter built all at once, Kaymakli appears to have developed in stages. Families likely carved and enlarged spaces as needs changed over time. That gives the city a more lived-in feel, almost like a neighborhood that slowly moved underground rather than a bunker designed in one moment.
One notable feature is its networked layout. Scholars say Kaymakli was linked to other underground settlements in the area through tunnels and shared defensive systems. For modern visitors, it helps explain that Cappadocia was not home to just one hidden city, but to an entire underground landscape.
Naours, France
In northern France, the underground city of Naours sits beneath a quiet village in the Somme region. The site includes roughly 300 chambers and galleries dug into chalk, according to local heritage managers. While parts of the network may date to earlier centuries, it became especially important when villagers needed shelter during periods of invasion and warfare.
Naours is often called a “muches,” a regional term for hidden refuges. Families could bring food, tools, and animals underground and stay there for stretches of time. Bread ovens, wells, chapels, and gathering rooms show that this was not just emergency cover but a functioning temporary settlement.
The site gained added historical interest after thousands of World War I-era inscriptions were documented on its walls. Many were left by soldiers from Britain, Australia, Canada, and other countries who visited while stationed nearby. That layer of evidence turned Naours into both a medieval survival site and a remarkable record of later wartime memory.
Petra’s Subterranean Chambers, Jordan
Petra is famous for its rock-cut facades, but many travelers overlook the city’s underground side. Beneath and behind its monumental tombs and buildings are chambers, water systems, and buried spaces tied to the Nabataean city’s urban life. Archaeologists have spent decades mapping how Petra functioned beyond the postcard views.
The Nabataeans built a sophisticated network to collect, store, and direct water in one of the driest parts of the region. Cisterns, channels, reservoirs, and carved chambers helped support a large population and passing trade caravans. That infrastructure was one reason Petra could flourish as a commercial hub between Arabia, the Mediterranean, and the Levant.
Some excavations have also revealed hidden spaces below major structures, including ceremonial and residential areas. Researchers continue to debate how some chambers were used, but the broader picture is clear. Much of Petra’s true city plan lies out of immediate sight, making its underground elements essential, not secondary, to understanding the site.
Orvieto Underground, Italy
Beneath the hilltop city of Orvieto in central Italy is a maze of caves, wells, tunnels, and cisterns carved into volcanic tuff. Local guides and researchers estimate there are more than 1,200 man-made cavities below the historic center. Many were dug by the Etruscans and later adapted by Roman and medieval residents.
These underground spaces served practical needs first. They stored water, housed pigeons for meat and fertilizer, and provided workshops and cellars. In a hill city where surface space was limited and siege was always a possibility, building downward made economic and defensive sense.
One of the best-known features is the Pozzo di San Patrizio, a 16th-century well commissioned during a period of military concern. Its double-helix stair design allowed pack animals and workers to move up and down without blocking one another. That engineering detail helps show how seriously Italian cities once planned for life below ground.
Coober Pedy, Australia
Coober Pedy is not ancient, but it is one of the clearest modern examples of underground urban life. Located in South Australia, the town became an opal mining center after precious stones were discovered there in 1915. Summer temperatures regularly climb above 100°F, so many residents built homes, churches, and businesses underground to escape the heat.
These dugout homes are cut into sandstone-like rock and usually stay much cooler than buildings on the surface. Residents have long said the underground lifestyle is less about novelty than comfort and practicality. In a remote desert setting, the approach also reduces energy use tied to constant air conditioning.
Today, Coober Pedy has underground hotels, galleries, and even places of worship that visitors can tour. It remains a working town first, not a theme attraction. That everyday quality is what makes it stand out from older archaeological sites, showing that underground cities are not only relics of the past.
Wieliczka, Poland
Near Krakow, the Wieliczka Salt Mine is widely known, but many visitors still miss how city-like it became below the surface. Mining began there in the 13th century, and over time workers created a vast network of corridors, chambers, chapels, and underground infrastructure. UNESCO has long recognized the site’s cultural and industrial value.
The complex stretches for hundreds of kilometers in total passages, though only a portion is open to tourists. Inside are underground lakes, carved altars, statues made from salt, and large halls used for ceremonies and gatherings. The most famous chamber, St. Kinga’s Chapel, shows how labor, religion, and artistry merged deep underground.
Wieliczka was not a city in the classic residential sense, but it functioned like a subterranean world with its own routines and social order. Generations of miners spent much of their working lives there. That makes it an important part of the broader story of how humans turned underground space into organized, meaningful places.
Beijing’s Dixia Cheng, China
Beijing’s Dixia Cheng, or Underground City, was built during the Cold War as fears of conflict with the Soviet Union intensified. Chinese state media and historical accounts say construction began around 1969 and involved extensive civil defense planning. At its height, reports described a network of tunnels and chambers designed to shelter large numbers of residents.
The system reportedly included classrooms, clinics, storage areas, ventilation systems, and spaces for basic daily needs. Some accounts from past decades claimed the network stretched for tens of kilometers beneath the capital. Exact figures remain difficult to verify publicly, but the scale of the project made it one of the most ambitious urban shelter efforts of its time.
Parts of Dixia Cheng later opened to limited tourism, though access has varied over the years. Even with restrictions, the site remains a striking reminder that underground cities are not only ancient inventions. They can also be products of modern geopolitics, built in response to threats that shaped entire societies.
