The history and future of cannabis.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

A floating cat sanctuary on an Amsterdam canal.

Museum preserving torture methods from the past.

The world's only museum devoted to the wonders of fluorescence.

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

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

Sweden's "good old days" painstakingly re-created in a model village.

Stockholm's deepest subway station is also a stunning ecological wonder.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

This crumbling folly looks like an enchanted left over from Middle Earth.

This haunting stone chasm is a hotbed of mossy rock and English legend.

This landmark Victorian folly rewards visitors with spectacular views over the Peak District.

Semi-precious Blue John stones have been mined in this cavern system for centuries.