This wooden mosque is one of the few remnants of medieval Poland's Muslim Tatar community in this deeply Catholic country.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

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

This micronation's flag honors its favorite drink, Kaffegöken, or "cuckoo-coffee."

Boats must transform into railroad cars to navigate this Polish canal.

The first, and perhaps only, monument dedicated to Wikipedia.

This towering statue of Jesus provided internet to the surrounding area.

Museum dedicated to "the man who moved the Earth."

The world's most delightful not-NOT-religion welcomes visitors to the town of Templin, just like its more stoic peers.

This antique thermometer honors the creator of the first universal temperature scale.

A haunting deserted hotel is a favorite with artists and photographers.

The largest of Denmark's seven mysterious round churches stands on an island in the Baltic Sea.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

This open-air museum was originally a World War II testing ground for German missiles and rockets.

A natural wonder in south Denmark.

An elevator into the Baltic Sea.

The first (but not only) upside-down house in Germany.

This 1960's Soviet submarine in Peenemünde Harbor claims to be the largest submarine museum in the world.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

Blitzkrieg bop your way through Berlin's Ramones Museum.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A museum specifically dedicated to the Trabant, one of the iconic automobiles of the GDR.

An old tram depot transformed into a vintage car paradise.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.