The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

A non-stop elevator ride in Vienna's city hall.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A Jenga-style cylindrical tower of books that appears to go on forever.

This doorless 20th-century elevator doesn't stop or slow down.

The hidden lair of an alchemist rediscovered in a 2002 flood.

The cutest way to stay safe in traffic.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

Colorful and chaotic stacked hotel in North Holland.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

Sail in for a ’dam good slice.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

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.

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

Europe's first floating restaurant is home to a hilarious legend.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

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

This unusual elevator doesn’t stop or slow down.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.