When the river dries up, these stones start talking.

Tall columns of volcanic basalt make up this improbable-seeming rock formation.

Steadily reminding Czechia of its past.

This former quarry is now a picturesque gorge that hides a sunken lake.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Two stunning 17th-century libraries and a cabinet of curiosities.

Digger attempting to hide itself under 300 tons of rubble.

A public display of random paleontology.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

The largest underground lake in Europe.

Explore the subjective dream of a hotel.

Created by a pair of artists, this former hotel was designed to provide a minimum of everything including comfort.

An unusual vending machine designed to support mourners during funeral ceremonies at Zurich's largest cemetery.

A monument to peace, built by one man over the course of 25 years.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

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

This museum is dedicated to the little known ancient Roman history of Vienna.

This cubist Vienna church building looks like some sort of alien stonehenge.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

Modern art commemorates one of the first military actions of World War II.