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

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Home to the deepest rift anywhere on Earth.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A geological mystery on Camelback Mountain.

A former major munitions plant that has been converted into a sprawling art space.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The once highest point in China blends symbolic design with a kick of adrenaline.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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.

The only road through the heart of Glacier National Park.

A museum dedicated to the alleged Roswell Incident.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

An enormous, inside-out glass globe built in 1935.

An unusual round church in London with a Templar past.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.