A bizarre house filled with an astounding array of collections.

The fairy tale castle of the "fairy-tale king."

Medicinal spa created with the discharge from a geothermal energy plant.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

A stately palace has been converted into the world's largest cannabis museum.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

A breathtaking and biodiverse wilderness in the mountain setting of Ernest Hemingway's "For Whom the Bell Tolls."

A controversial art piece that harkens back to local folklore.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This massive library holds what was once the largest book collection in the world.

France's most famous cemetery, with some of its most curious tombs.

This stoic, if derpy, giant stands as a monument to Oregon's statehood and the novelty culture of yesteryear.

The magic's in the hole!

A subterranean house of worship carved right out of the bedrock.

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Commemorating the spot where the famous scientist fed his pigeons.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.