The largest stone circle in the world has ended up bringing up more questions than it has answered.

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

A neolithic dolmen that was rebuilt after collapsing during the 19th century.

This stunning concert hall has become a symbol of Iceland's national recovery.

Perhaps the only prehistoric monument with its very own public bus stop.

A circle stone within a stone circle.

The bones of two medieval royal lions were discovered at the historic fortress.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

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

This bewitching Babylonian goddess haunts a hallway of the British Museum.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

A naturally mummified 2,000-year-old man.

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