This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

Yo, Adrian!

Dine like an American revolutionary at Colonial Williamsburg.

America's first public mental health facility.

Originally known as the State Lunatic Hospital at Norristown, this campus stands as a fascinating piece of medical history.

Experience a charming 1930s version of "infotainment."

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

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Once on display alongside a giant Gumby, it’s as tall as a nine-story building when fully extended.

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

This water tower commemorates the invention of the transistor on this site in 1947.

The real-life ‘Severance’ office building.

Experience the pivotal Civil War battle at this interactive museum.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

There aren't too many operational funiculars around, but Pittsburgh has two!

This mountain clearing, created during World War II for an oil pipeline, provides a view of NYC from 40 miles away.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).