An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

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

A museum dedicated to the history and exploration of both popular music and science fiction.

A wall of chewing gum moonlights as collective art.

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

A giant Troll lurks under one of Seattle's oldest bridges.

A one-of-a-kind collection of a unique medium.

Resting place of Hollywood's immortals is also site of summer film screenings.

America's most famous piece of self-built architecture.

A walk through the historic city center, under the streets of Seattle.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A layered tribute to the work of mosaicist Isaiah Zagar.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

The legendary building that needed ghostly approval before being built.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Perhaps the most unique of any Frank Gehry design for one simple reason: Gehry himself actually lives here.