The tunnels are lined with carefully arranged skulls and bones, with plaques bearing inscriptions about life and death.

There are caves, ancient cities, museums and even theme parks down there, all waiting to be enjoyed and explored. Although unavoidably subjective, we've ranked 31 of Europe's underground attractions ...

The mystery only deepened when Italian researchers claimed to have discovered a 'vast underground city' from giant vertical ...

Derinkuyu is situated under the historical region of Cappadocia and is the deepest of 36 underground cities. This sprawling subterranean metropolis, reaching depths of around 85 meters (279 feet ...

In a new find under five historic homes in the Iranian city of Abarkuh, archaeologists discovered an underground settlement ...