Hidden in the forest are the remains of a former World War II chemical plant.

A meteorite-bounded town in Bavaria.

Behold, a collection dedicated to Germany's favorite vegetable.

Before serving as James Bond's Casino Royale, this Victorian-era spa catered to the world's elite.

These 17th-century mummies are no longer naturally preserved, but remain on display today.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

Bohemian paradise covered in majestic forests.

This formerly-prosperous Silesian mining town was completely demolished in the late 1960s and early 1970s as an attempt to cover up a secret Soviet uranium mine.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

An extensive network of secret tunnels was created for the Nazi project "Riese."

The world's northernmost flowers cling tenuously to life on desolate Kaffeklubben Island.

Cold storage for agricultural biodiversity.

Lithuania's outdoor sculpture trail of wooden folk art.

An extensive collection of some of the oldest grave markers in Lithuania.

A narrow strip of land is home to the tallest migrating dunes in Europe.

The Latvian city of Ventspils is filled with dozens of cow statues showcasing unique themes.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

A black cat protests the City Guild in Riga's Old Town.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

3,000 market stands in five former Zeppelin hangars.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

World's strongest whirlpool.