People have been living in the cave houses on this Italian hillside since the Neolithic era.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

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 once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

See massive fossils that are over 200 million years old in northeastern Arizona.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Where beautiful signs live on forever.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Every four years, millions of salmon fill a river so densely that its waters appear deep crimson.

The large fjord lake is thought to be the home of "Ogopogo," a giant sea serpent.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

Fossils, railroads, and waterfalls!

Few other hotels can rival the grandeur of the Castle in the Rockies.

A sleepy little town that had the greatest landslide in North American history fall on it.

This massive and unusual rock formation near Okotoks is the world's largest known glacial erratic.