You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

Why walk on this historical site when you can zoom down instead?

Illegal drag racing two stories beneath Chicago’s streets.

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

It's good luck to be mocked by this monkey.

An overlooked memorial honoring the local Washington residents who died in World War I.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

One of few surviving standpipe water towers in the U.S.

Take a monster truck tour around an ostrich farm in the middle of the desert.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

This natural wonder is disappearing at an alarming rate.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

The castle where Martin Luther secretly translated the New Testament from Greek to German while in hiding.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The site of Austria's biggest concentration camp now honors its victims.

The national park was once a plantation estate.