The most visited, and possibly most controversial, museum in Germany.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

The "dragon babies" of southeastern Europe.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

First point in the Struve Geodetic Arc, a 19th century undertaking to measure the Earth's size and shape.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

These Finnish rapids have been attracting tourists for over a hundred years and are now released with the push of a button.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Ancient catacombs form the foundation for this Rococo orgy of a church.

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Man-made mineral caves house massive bat colony.

Historic slum of Tartu.

This old Estonian mine has been kept like a sprawling time capsule of the local shale industry.

Mysterious craters may have been home to an ancient cult.

A subterranean house of worship carved right out of the bedrock.

An alien church provides much needed silence in the midst of a Finland shopping center.

A wooden replica of France's famous tower.

Legend has it that not even Stalin could pull down the 2015 European Tree of the Year.

Wars fought and wars won are remembered by these abandoned bunker ruins.

This small Estonian hill is covered in hand-made twig crosses that are said to bring good luck.