A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

A tongue-in-cheek arcade where the games are based on everyday life.

This London marker celebrates the spot where the world-famous English band was founded.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

A collection of noses tucked inside an art museum reveals how times have changed.

Copenhagen's celebrated theme park and gardens.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

A hands-on traveling collection of the innovative devices of yesteryear.

A terrific purveyor of natural history objects and curios.

The Netherlands' first car tunnel has an unusually rectangular shape.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

This ghost town in Belgium will lose its street art when it ceases to exist.

Dummies recreate radiological discoveries from history.

Housing the groundbreaking maps and globes of Gerard Mercator.

Take a leisurely walk through the park to find the seven giant troll sculptures hidden throughout the park.

Medical history with an amazing, if frighting, collection of wax diseases on display.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

This modern arts center is built around a gem of late-Baroque architecture.