This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Vast stretch of tide-pools with a unique Moroccan charm.

A fortified city, home to a remaining population of five families

Visitors to this Belgium graveyard are greeted by the grieving stone parents of the young men lost to war.

This gruesome biblical parade celebrates the one day a year that a bit of Jesus' blood turns to liquid.

A giant bug impaled on a 75-foot-tall needle.

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

A visionary precursor to the Internet made of index cards.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

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

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

Christ's blood preserved in a Belgian town.

A little sculpture with a large wardrobe.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This ghost town in Belgium will lose its street art when it ceases to exist.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Op-art architecture designed for happiness.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The last bastion of Roman presence north of the Alps looms over a German town.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.