The 30,000-volume library is one of the world's most impressive poetry collections.

The beloved home to all publications indie, erotic, and punky.

A lush green oasis in the middle of Chicago.

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

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

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

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

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

Oslo's historic toboggan run has been letting thrill seekers slide from train stop to train stop for over a century.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

According to the locals, the sands of this secluded Norway beach are infused with gemstone particles.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

Walk behind a 50-meter-high waterfall.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

Walk 2,300 feet above the ground on the "Troll's Tongue."

Sleep in a climate-controlled plastic bubble for the night.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.