The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

The land is home to swimming ponies and a legendary 18th-century treasure.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This golf ball–shaped former desert real estate office now houses a UFO museum.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

A collection of artifacts from Maryland's maritime past.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A bit of retro transportation flair preserved in the world's largest department store.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

Look closely and you’ll notice that the color changes a third of the way up the tower.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The "lovely red Vega" of the legendary record-settling pilot.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

There’s a hidden military meme engraved on the World War II Memorial.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The United States Capitol's former columns still stand.