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

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

An underground city of salt.

Underwater roads undetectable from the surface used for escape routes from foreign invaders.

The pyramid and dome deep inside the Dzūkija forest are believed to channel divine energy.

Once known throughout Europe, this tiny and unusually progressive 18th century micro-nation within Lithuania now lies in ruins.

The oldest funicular in Lithuania has been climbing this steep hill since 1931.

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.

Things aren't quite what they seem at this mind-bending museum.

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

This abandoned secret city is a crumbling wonderland of Soviet ruins.

This seaside pine grove features an exclusive watchtower that presents amazing views.

This statue is dedicated to the animal cosmonauts that perished during space flight experiments.

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

Mysterious heaps of stones dot these otherworldly woods.

A top secret Cold War bunker hidden beneath a Latvian spa facility is now open for tours.

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

3,000 market stands in five former Zeppelin hangars.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Medieval village and microminiature museum.

Notorious artist squat renovated into legal studios.

The widest natural waterfall in Estonia is a sight to see in all seasons.

This disappearing geyser has been attributed to witchcraft, but really it's all about rainfall.