This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

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

The only ancient site that remains on the south bank of the sacred Ilissos river.

These caves secretly held national treasures during World War II.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

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

These engineering masterpieces are a dominant feature of the Belfast skyline.

During the heyday of fishing in Hastings, there were more than 100 of these storage facilities.

Preserved behind glass, the ruins of a medieval building used to store human remains.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

An important example of architectural history slowly decays in the city center.

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

This reconstructed Norman castle is the world's most accurate, from location to livestock.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

This inn of the court provides a fascinating window into London’s legal and architectural history.

This curious Tudor-era castle was once home to Napoleon's greatest adversary, the Duke of Wellington.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

The historic villages and towns of Suffolk are filled with wonky wooden beam houses painted an unusual shade of pink. Unknown to many though, this sweet shade has a bloody history.

This airport currywurst stand is made out of retro airplane parts.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

Brass bricks outline the locations of Edinburgh's lost, lively market stalls.