A labyrinthine underworld of tunnels and caverns hides beneath the city.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

A grove of "candelabra redwoods" deep in California's Lost Coast.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

This tiny chapel next to a highway provides weary travelers a place to rest, pray, or maybe even get married.

This speakeasy continues the Prohibition-era legacy of Harlem's jazzy Swing Street.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The atmospheric road was never meant to be so creepy.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The historic bar where local ship captains, traders, and gold miners would come together to do business a century ago.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

This hidden labyrinth offers walkers some brief peace of mind.

This mysterious artificial cave has long puzzled New Englanders.

The oldest still-operating tavern in the United States was once owned by a pirate.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

Legend has it fairies gathered at the site of this medieval castle.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

The skeletal white beams stand as a monument to religious dissent.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.