This disused Cold War bunker has been restored to all of its early 60s glory.

The only remaining Cold War–era Minuteman II missile control center in Missouri.

This Cold War–era fallout shelter was actually a storage facility for the nation's emergency currency.

A former special storage facility for documents during the Cold War.

Canada's subterranean Cold War museum has doubled as a movie set.

This museum sits on the site of a decommissioned military communications base.

At nearly 1,000 feet long, this astonishing glass suspension bridge is one of the longest in the world.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

This terrifying glass bridge on the side of a mountain cracks as you step on it.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

This improbable contraption was passed down through five generations of industrious Tennesseans.

After the musical legend's death, his memorial was mysteriously graffitied in gold.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Pumpkin-like gargoyles and grotesques peer down from the rooftop of this unassuming apartment building in Illinois.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This innocent-looking townhome is actually a subway exit.

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

An unassuming secret door once led to a legendary watering hole.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

During the holidays, a vintage subway train whisks New Yorkers back in time.

Paths are maintained, but trees have taken over plots.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

Local legend has it that an old, decaying staircase outside this cemetery is haunted by dozens of ghosts.