Mysterious stone tower featured in many alternative histories of the New World.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

This East End pub gained notoriety as the site where gangster Ronnie Kray publicly shot a rival.

This mysterious and unique painting is filled with symbolism.

This peaceful park with centuries of history hides in an overlooked section of South London.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

An architectural oddity hides in plain sight on this iconic London bridge.

Victorian-era Londoners really wanted to believe this 17th-century cistern was actually an ancient artifact.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

These morbid carvings remind churchgoers of the inevitability of death.

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

This secret garden has bloomed into London's most unique hub of urban creativity.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

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

This secluded walkway overlooks a magnificently wild London green space.

A Roman spa buried deep beneath the City of London.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

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

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

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

A museum wholly devoted to juvenescence.

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