A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

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

Black cat statues guard this temple-like Egyptian revival factory.

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

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

This 19th-century pub features stained-glass windows celebrating Victorian-era "champions."

The ritual has been performed uninterrupted for nearly 700 years.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

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

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.