A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Cozy basement bar sports an inventory of over 2,000 beers.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This abandoned Belgian fortress is purposefully being left to nature.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

Striking occult iconography on a medieval German church.

After this historic church was destroyed by World War II bombing, its blackened shell was left standing as a monument.

Enormous sandstone towers loom within a Czech forest.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

This bell stars in a tragic love tale and is said to make wishes come true.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

A 20th-century picture show in 3-D.

This hidden collection of everyday objects illustrates life within communist Poland.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

The site of the first battle of World War II.

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

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

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This beautiful, historic church looks like something out of a simpler past.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.