This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

Black cat statues guard this temple-like Egyptian revival factory.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Repository for more than 22 million pickled specimens.

The final resting place to 300 Victorian-era pets hides inside the city park.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The non-native bovine herd was brought in to help conserve these Berlin wetlands.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

Art and a pun, all in one.

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

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

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

Walk through Czech history in Prague's largest graveyard.

The hidden lair of an alchemist rediscovered in a 2002 flood.