Subterranean

This building, previously used as a courthouse, has an unusual geological feature in its basement.

A special area of the National Archaeological Museum of Naples is located inside a metro station.

A southern Swedish island is home to the last ERSTA artillery battery, meant to protect the shoreline during the Cold War.

This forgotten chalk mine was reopened thanks to a massive effort from the local community.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

This subterranean town of over 50 dwellings lies thirty feet beneath the Earth's surface.

This Underground station has been a popular filming location for decades, even before it closed.

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

These wondrously illuminated caverns extend under the mountains of the Fukushima Prefecture.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.

This amazing ancient cave was kept secret for seven years to protect it from the public.

Underneath the bustling city streets, a hydroponic farm grows unique herbs in an urban oasis.

A maze of underground tunnels beneath one of the most beautiful forts in Serbia.