19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

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

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

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

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

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

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

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

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

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

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

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

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

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

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

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.