The telescope that discovered Neptune.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

This demon atop the Notre-Dame de Paris looks utterly bored.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

Clean, cold drinking water flows from a nondescript pipe in a roadside rock face.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

An Alaska livestock farm devotes itself to harvesting wool from creatures that once ran with mammoths and sabertooth tigers.

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

Colorful boxes placed over the dead are left to rot and crumble.

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

This super-sized statue is the only public memorial to the deal that ended America's neutrality during World War II.

A morbid gateway to an Alaska town prides itself on the hunting history it represents.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

The king of U.S. high points towers over every other peak on the continent.