Designed to resemble foreign architecture, this mosque-looking structure was used to pump water to a royal fountain.

This four-story steel sphere in Maryland was used to test biological weapons.

A stone burial chamber that was also the site of religious rituals.

An abandoned World War II bunker is part of a chain that runs throughout Washington.

A facility built in 1992 for an underground nuclear test remains in place today.

A drinking water fountain in the heart of Mumbai, built by a father in memory of his son.

One of the last designs from architect Oscar Niemeyer.

Eight naturally mummified bodies in glass coffins are housed in an underground crypt.

The remains of a concrete ship sit on a sandbank between Ballina Quay and Belleek Woods.

Heralded as one of the prettiest castles in all of Czechia.

Mysterious tombstones thought to be remnants of Atlantis.

This shrine to the patron saint of Alaska sits on a small tidal island and was built from the land’s own beach stones.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

The final resting place of one of Germany's most accomplished Renaissance men.

A very big rock just plopped down in the New England woods.

Invented in the mid-19th century, this machine could send copied images via telegraph lines.

An abandoned Ecuadorian prison that once held ex-presidents and notorious con artists is now a carceral museum.

After this former brothel closed, its interior remained almost frozen in time.

What happens when a chef with indigenous roots takes over a hotel-restaurant?

One of the last remaining buildings from one of Calgary's earliest businesses.

The New Central Library is a masterpiece of contemporary architecture in the midst of downtown Calgary.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

A curious art park at the geographic center of Europe is home to 3,000 television sets and other wonders.