While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A virtually untouched "home on the hill" for the flora and fauna of Rhode Island.

A cherry tree growing atop a mulberry tree.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

Bell tower juts out from a village buried under a lake.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

Go inside to really appreciate this 500-year-old technological masterpiece.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The oldest operating pharmacy in the world features 800-year-old recipes.

An Italian hillside ghost town.

The glowing blue Nymphaeum of Emperor Tiberius.

This 16th-century monastery has been turned into a surrealist architecture compound.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Pompeii's less famous neighbor is still revealing her secrets.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

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

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

Central Europe's largest collection of mini-bottles is on display at this museum devoted to a bitter Hungarian liquor.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This semi-hidden Manhattan restaurant is based out of a loading dock.