The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

A set of seven houses, each built in a style that represents a European country.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This plaque marks the former home of one of the first women physicians in the Netherlands.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The facade of this bank has changed little over the centuries, including its unique welcome sign.

A public urinal so pretty, it was declared a national monument.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

The former headquarters of history's oldest megacorporation.

A unique work of automotive art calls this shopping center home.

In 1988, jazz legend Chet Baker fell to his death from a window of this hotel facing Amsterdam Centraal.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This banal Parisian entranceway is not what it seems.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

The curious underground history of keeping Paris clean.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A surreal statue honoring Prague's favorite literary son.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.