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

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

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

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

The gutted remains of this Estonian mansion are a monument to a tragic love.

Mysterious craters may have been home to an ancient cult.

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

A curious art park at the geographic center of Europe is home to 3,000 television sets and other wonders.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

Just another terrifying garden filled with hundreds of endlessly smiling doll people.

Surreal works of unreal stone and metal dot the landscape of this Latvian art park.

This wooden recreation of a 9th century lake village looks as though it was built yesterday (which it relatively was).

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

These crumbling Latvian forts make for some haunting seaside ruins.

3,000 market stands in five former Zeppelin hangars.

Spend the night in 1920s Latvia in this historic recreation and movie set.

Flamboyant architecture from the turn of 20th century.

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

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

Walk behind a 50-meter-high waterfall.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

A serpentine highway twists and turns over the treacherous Norwegian Sea.