Tune into an alternate universe at this immersive art installation.

Fall through a crack in the seams of reality at this immersive art installation.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

A sharp bend in a dramatic river canyon cut through red rocks.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

Hike up to this ancestral grain storage site, but don't touch.

The lost ruins of the forgotten ferry lie hidden beneath the silt.

Frank Lloyd Wright died a year before construction on his largest public project even began.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A tribute shrine where the Space Invasion street art movement started.

A massively oversized measuring tape sculpture sits inside a hidden yard.

Home to the "Rat King" of Nantes and other wonders of the natural world.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

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

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

This 400-year-old tree is actually an immigrant from North America.

This modest marker near Notre Dame identifies the very center of Paris.

This demon atop the Notre-Dame de Paris looks utterly bored.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The video game-themed street art first popped up in the French city.

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

A gruesome combat between a hunter and a furious momma bear.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.