Tucked away behind the mansions of Mayfair, this picturesque garden is a hidden London treasure with a spooky past.

This overlooked street light once served as a KGB dead letter box.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

A unique tribute to the millions of animals who served and died for the British military.

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

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

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

This iconic high-rise residential block was one of the last to be built in the Brutalist style.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A faded reminder of what was once a common sight in London during the Blitz.

The medieval woodcut-style artwork chronicles life in medieval London.

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

This third-generation institution is one of the last in London that still cures its own salt beef for epic sandwiches.

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

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

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

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

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

One of America's founding fathers lived in this London lodging between 1757 and 1775.

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.

A series of carved figures that scandalized British society.

Classic game cookery takes center stage at what's widely considered London's oldest restaurant.