Suffocating dogs was a common spectacle in the fumes of this noxious cave.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The only remaining section of an aqueduct that used to supply water to Manila during the Spanish occupation.

The first religious structure on the island of Luzon and a survivor of World War II.

This historic Art Deco building embellished with local tropical fruits had fallen into disrepair before a recent restoration.

A series of increasingly larger sundials have grown with this school.

A place where you can symbolically rid yourself of negative thoughts and attitudes.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

This work of engineering is imbued with elegance and ingeniousness.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

Third time's a charm, or in this case, two testicles are.

A Milanese café entirely designed by the American director Wes Anderson.

The largest of the Fuji Five Lakes is home to an impressive swan population—some real, some with paddles, and one with an observation deck.

A 70-foot-deep ice cave formed by lava from Mt. Fuji on the edge of Japan's "Suicide Forest." 

On stormy days debris from this unfinished and abandoned skyscraper rains down on the Bangkok streets.

This massive piece of artwork weighs more than 250 tons, and was designed as a tribute to the first president of the United Arab Emirates.

No building in the world leans as far as the so-called “Leaning Tower of Abu Dhabi.”

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Rome’s legendary peephole vista is also a former Crusader stronghold.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.