Scars of this building's past life as a violent prison still cover its walls.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Cold war icon and onetime "hole" in the iron curtain.

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

A fascinating insight into daily life in the Eastern Bloc.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

This 1,300-year-old marker is one of the finest and most complete early Christian crosses in Scotland.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

This stretch of beach is the site of a prime watering hole and a primate watchtower.

This ancient oak tree sheltered accused "witches" in the 17th century.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

The graveyard with the highest IQ in Britain.

Collection dedicated to brands, packaging and advertising.

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.

London's smallest police station is barely the size of a phone booth.

Catacombs turned marketplace.

Rebuilt remains of a temple to Roman god Mithras.

An unusual round church in London with a Templar past.

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

A tongue-in-cheek arcade where the games are based on everyday life.