This gigantic monument hidden in the woods was built to thank the Dutch for sheltering Belgian refugees during World War I.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

This punny mirror of another Wisconsin attraction is exactly what it sounds like.

One of the shortest streets in York has an especially odd name.

Because sometimes the most efficient route from A to B isn't a straight line.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

A network of concealed passageways lies within a busy London Underground station.

All that remains of a gigantic earth-moving machine.

This Roman quarry once held secret masses and smuggler's contraband and is now home to rare species of bats.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

The vertical-axis windmills of ancient Persia have been grinding flour for 1,000 years and counting.

This isolated airport in the middle of the Everglades sees more alligators than planes.

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.