Elevated freight railway turned wildly successful urban park.

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

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

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A breathtaking 19th-century trail overlooks Lake Tahoe.

This settlement on the original Transcontinental Railroad began by harvesting timber, but transitioned to a forgotten 19th-century industry: harvesting ice.

The so-called "Father of Las Vegas" had the city's first telephone installed in his office in 1907.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

This former shopping outlet is now adorned with beautiful graffiti and murals.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

These markers are used to document elevation changes around the famed dam.

Experience a charming 1930's version of "infotainment."