Copenhagen's celebrated theme park and gardens.

Hamburgers are intensely proud of their tunnel beneath the river.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Art and a pun, all in one.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

The most visited, and possibly most controversial, museum in Germany.

Started as a kitchen garden, now the second largest botanical garden in the world.

A slice of central Asia in the middle of Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

Obelisks and stone pineapples in the Irish countryside.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

The curios of pharmacist and collector Henry Wellcome.

This South London cemetery holds the remains of more than 15,000 people.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

A mysterious artist-run cabinet of curiosities and library.

One part local history, 99 parts gruesome haunted house.

The underground sanctuary of a mysterious ancient cult.

Rebuilt remains of a temple to Roman god Mithras.