Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A curious cave church carved into the face of a cliff.

This abandoned Soviet circus is slowly being restored to its Communist-era glory.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

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

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.

These abandoned vessels are destined to be reclaimed by the forest.

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

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

The chimney of a shuttered power station in the Po Delta is the second-tallest structure in Italy.

A former mining village that now operates as an open-air museum.

This crystal clear water basin feeds the Lao river and powers a hydroelectric power plant.

This decaying complex from the early 1900s was once the site of massive iron and fluorite mines.

Before the more famous Royal Palace of Caserta, the king of Naples first commissioned this overlooked residence.

This castle was once the home of one of the most powerful women of the Renaissance.

This uniquely designed bridge served as the city gate for Comacchio.

A founding document of the European Union was written on an island where Roman emperors once banished women.

A stately castle in the northern Italian countryside has been restored after years of neglect.

A town saturated in Italian rationalist architecture was once marshland drained by Mussolini.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.