Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Remnants of a Victorian garden feature sitting in public woodland.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Rebuilt remains of a temple to Roman god Mithras.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

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

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

A building that survived WWII, possibly on the virtue of its name alone.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

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

Despite a history of destruction, this former citadel survives to document Afghanistan's oft overlooked history.

Museum dedicated to overthrowing the Soviets, complete with diorama of Soviets being beaten to death with shovels.

Where the father of Persian poetry is laid to rest.

This dark, damp, perilous tunnel is the only passage from north to south Tajikistan.

Space-age minarets towering over Islamabad.

A mere stone's throw from Islamabad exists a spectacular display of three millennia of humanity's progress.

The world's second-tallest flagpole stands proud despite dropping rank.

A strip of neutral ground where the people of Tajikistan and Afghanistan come together to trade.

Unique pagan culture in three extremely remote mountain valleys.

A city entirely devoted to illegal gun production.

What was once supposed to be the symbol of a shining Afghan future is now a bombed-out ruin.