Ride the subways of yesteryear.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

The 19th-century vessel floats proudly on Lake Titicaca, but its journey from Britain to the Peruvian altiplano was far from smooth sailing.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The abandoned medieval theme park was meant to be the "Disneyland of the Philippines."

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

This dramatic rail curve was once the target of a failed Nazi attack.

The deserted pirate-themed restaurant still entices explorers.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

This abandoned lighthouse looks like a rusting oil rig, but has managed to survive a number of storms.

The first skyscraper to include a Ferris wheel built into the facade.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A rusted metal giant pays tribute to Birmingham’s industrial past.

A stone marker memorializes the spot where the King broke up a street fight with a classic karate stance.

This beautiful example of Victorian engineering is the oldest water-balanced funicular anywhere in the world.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

There's a crumbling old mansion inside the Smithsonian National Zoo.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.

A remarkable lava formation encloses a line of Buddhist statues that can't be accurately counted, according to local mythology.