This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

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

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

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

The remains of Crystal Palace Great Exhibition of 1851.

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

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

A hands-off space for graffiti artists to hone and display their skills.

Banksy gives themself artistic license with this piece of London street art.

A kaleidoscopic warehouse-maze of handmade neon signs.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A network of concealed passageways lies within a busy London Underground station.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

An Italian hillside ghost town.

Spend the night in 1920s Latvia in this historic recreation and movie set.

The abandoned village of Skarð aptly illustrates the idiom "Don't put all your eggs in one basket."

Lavish royal estate punctuated with heated greenhouses.

Abandoned medieval hill town.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

This ghost town in Belgium will lose its street art when it ceases to exist.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

A fantastic castle rumored to be the birthplace of King Arthur.