This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The world's only museum devoted to the wonders of fluorescence.

Mosaics created from 11 million cigar bands.

The place where Czar Peter I of Russia resided in 1697 during his Grand Embassy.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

The world's longest wildlife overpass provides Hilversum's critters with a safe alternative to trying their luck on the roadway.

Graffiti covers the walls of a room where university students through the centuries have waited nervously to defend their theses.

A former plague hospital turned medical museum.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

A pilgrimage site where people ask Saint Dymphna to watch over those who are not of sound mind.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

The highest point in Belgium is a staircase to nowhere.

Hiding the longest subterranean river known in the world.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A Museum of Psychiatry in a still-operating mental institution.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

A moving memorial to the fallen and missing from WWI trenches.

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

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Medical history with an amazing, if frighting, collection of wax diseases on display.