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

A 16th-century horror show built in a lovely Italian garden.

A toxic ghost town sitting atop a massive coal fire.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Enormous lake at the bottom of a unique cave system.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

This shop specializes in oddities and Victorian-inspired wonders.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Notorious artist squat renovated into legal studios.

Elevated freight railway turned wildly successful urban park.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

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