The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This sculpture encompasses the emotion of rail travel.

The curios of pharmacist and collector Henry Wellcome.

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

This abandoned shopping arcade has new life as an art installation.

Legend says this sacred tree was a gift from goddess Athena.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

The ruined doorway is a portal to the building's turbulent and torturous past.

These caves secretly held national treasures during World War II.

A Byzantine-era church hidden in a wooded area below the Acropolis.

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

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

A domino effect created with Britain’s iconic telephone boxes.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

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

The anatomical-pathological collection of a man who changed surgery.

The river that gave its name to a 1960s musical movement has a rather inauspicious starting point in town outside of Manchester.

Paul McCartney, Joy Division, and many others created era-defining music at this former recording studio.