This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

A modern reimagining of a medieval city gate.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This bike path traverses the treetops.

Six turbines towering over a wide road for passersby.

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

A 12th-century fortress containing some of Berlin's oldest buildings.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Started as a kitchen garden, now the second largest botanical garden in the world.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

This unusual elevator doesn’t stop or slow down.

Ruins of a German Castle on top of a towering stone pillar.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Macabre astrological automaton clock dating to the late 1400s.

Famously misunderstood wonder of the ancient world

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

The fairy tale castle of the "fairy-tale king."

Abandoned railway line circling the city of Paris.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.