A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

A strange and ancient landscape hides the dark, cavernous remains of a 5,000-year-old flint mine.

A collection of old neon signs from all over Poland line a secluded courtyard.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

A measuring mishap led to these artificial stone ladies losing their stomachs.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

London's amazing modernist public square that never was.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

The taxidermied remains of a once-great parrot.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

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

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A cluttered and astounding collection of antiquities and curiosities.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.