This historic Amsterdam bar used to accept sailor's monkeys as payment.

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

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

Rumored to have been frequented by Vincent van Gogh, it's the only remaining genever producer in the Hague.

At this exhibit on the world of poison, venomous animals steal the show.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

The amazing wonder cabinets of a very rich Austrian archbishop.

Deep underground, the rusting remains of a German water pumping station from World War II.

Apparently, Hell has waterfalls in Slovenia.

A cemetery for Slovenian notables also serves as a popular recreation space.

A beautiful drive through the foot of the Alps traces the path of 15th-century Turkish raids.

The "dragon babies" of southeastern Europe.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

A unique waterfall that some believe attracts the fairfolk.

The famous Alice Liddell designed this memorial after losing her sons in World War I.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.