A rare, flower-shaped example of Brutalist architecture in Switzerland.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

One of downtown Berlin's last reminders of its Communist past.

Floating swimming pool within a moored vessel.

A 12th-century fortress containing some of Berlin's oldest buildings.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

France's most famous cemetery, with some of its most curious tombs.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

This five-star hotel was originally a swanky parking garage.

This magnificently macabre shield shows the power of chivalrous love in medieval times.

The world's oldest optical museum is an odd collection where the exhibits look at you.

This historic building displays the remains of a victim of the devastating 14th-century plague.

The fences outside some of South London's estates are made from recycled World War II stretchers.

Taxidermied animals galore, by appointment only.

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

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

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

The cedar tree in Highgate Cemetery earned its title by accident.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

Giant, friendly pelicans in Central London, the most unlikely of places.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.