The largest of London's subterranean rivers and once a mad, bad center of London life.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

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

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

Remnants of a Victorian garden feature sitting in public woodland.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

This 1920s Dutch barge is now a floating bookstore.

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

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.

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

The church and nearby castle are all that remains of a medieval village, mysteriously abandoned.