The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

An underground blaze turned this village into a ghost town.

A toxic ghost town sitting atop a massive coal fire.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

A eight-foot-tall statue resides in the heart of Pennsylvania anthracite coal country.

This national landmark is also home to a massive treehouse.

Most of Britain's gold reserve was secretly stashed here after the start of World War II.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

In the Netherlands, one of the world's largest private car collections can be found.

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

For decades, a bottle factory dumped their waste into these waters—now it's considered the best sea glass beach in England.

An authentic, seaworthy replica of the ship that sailed to Newfoundland in 1497.

A historic, reportedly haunted pub that provided inspiration for several famous adventure novels.

Banksy's image of a naked man dangling from the window of a sex health clinic.

After protestors toppled a statue of a 17th-century slave trader, the pedestal where it once stood remains unoccupied.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

The world's largest single-aperture telescope resides in the Canary Islands.

The longest eruption in the history of La Palma originated with this volcano in September 2021.

You can soak in three relaxing pools filled daily by the tide.

Tour the inside of a massive lava tube formed during a 1949 volcanic eruption.

Volcanic rocks ground down into sand make this Spanish beach as black as night.