A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

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

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

A recently restored Shoreditch landmark with ties to Jack the Ripper.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

This Underground station has been a popular filming location for decades, even before it closed.

Home of one of history's most famous cartoonists just as he left it.

The secret wartime bunker built on the platforms of an abandoned Tube station.

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

This 20-foot mountain is made up of some 15,000 mannequins—if you visit, you can even take a piece home with you.

A large collection of steam engines, organs, and fairground attractions.

A slightly surreal menagerie of structures that were lovingly spared from demolition and reconstructed in a field.

A museum wholly devoted to juvenescence.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

A historic house left in "dramatic still life."

A wellspring of creativity in an already artsy East London neighborhood.

Explore nearly 400 years of English middle-class home life.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

The anatomical-pathological collection of a man who changed surgery.

One of the oldest remaining Catholic churches in England is home to the hand of a 7th-century saint.

This pub has roots dating back to 1430.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

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