Read between the lines of the subway map to find the hidden abandoned Civil War fort.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

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

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

The remains of the first punk club in L.A.

Historic funicular railway, believed to be the shortest railroad in the world.

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

Sister store to the Echo Park Time Travel Store.

A faux European lane smack dab in downtown L.A.

This serene oasis in an affluent Los Angeles neighborhood holds some of Gandhi's ashes and got Elvis into Eastern Philosophy.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

An essential stop before plundering, BYO Cutlass.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

A common entry point to the Griffith Observatory trail holds its own wonders.

The ghostly remains of an accidental sea.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The magic's in the hole!

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

San Francisco's newly reopened hands-on science museum.