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

The oldest continuously inhabited street in America.

Hundreds of thousands of ancient documents offer a unique glimpse into Jewish life in Cairo.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Largest Roman Catholic church in North America.

Built in 1512, the oldest cathedral in the Americas.

Hiroshima survivor on Riverside Drive.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Detailed sandstone carvings show an array of symbolism and adorable animals.

Norway's oldest cathedral still in use.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

This Orthodox Church's exterior is rather unorthodox.

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

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

This small collection of rare books was uniquely locked up for safe keeping.

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

A famous burial ground with a history both grim and literary.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A historic arboretum and non-conformist, non-denominational park cemetery.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.