An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A winding path built in secret on the edge of the continent.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

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

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

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

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

Try not to get slimed in Tribeca.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

The world's only museum devoted to the wonders of fluorescence.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

World's largest collection of serial killer artwork and other macabre exhibits.

A psychedelic labyrinth on the San Francisco bay.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

The only theatre in the world constructed specifically for sound movement.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.