Preserving the research tools, unexpected inventions, and odd collections of generations of college professors.

This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

This monument pays homage to a classic Dutch tune.

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

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

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

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

The attic of a four-century-old canal house hides a clandestine church.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Cat art as far as the eye can see.

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

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

Designed to inspire artists visiting the island.