This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

The solemn exterior conceals an opulent interior of this 17th century church.

An exquisite Baroque church in Vienna's old town.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Two stone columns flank the grand Venice square, but there were supposed to be three.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

Caves famous for the dragon-slaying saint who lived there.

The fairy tale castle of the "fairy-tale king."

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A Viking-style brewpub named for a Norse sea giant, in the heart of fjord country.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

An intricately carved Viking church overlooks a glistening fjord.

Thousands of miniature bronze sculptures have taken over this city square creating a unique art installation.

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.