The remains of Crystal Palace Great Exhibition of 1851.

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

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

An ornate and disused early 20th-century building has been given new life as a fully operational structure, complete with offices, oyster bar, and a furniture retailer.

Manchester's abandoned train depot lingers in a post-industrial purgatory.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

The commemorative stone column conceals a secret laboratory.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The Great Fire of London and the regulation of one-way streets both started in this alley.

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

This Tudor-era castle was once part of King Henry VIII's plan to protect England from invasion.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Legend says this public grazing area hasn't been plowed for thousands of years.

A domino effect created with Britain’s iconic telephone boxes.

This astronomical clock is the second oldest in England.

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

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

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

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

The spot where Oxford garnered its name was also home to a medieval philosopher and includes a house covered in statues.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

A hunk of prehistoric lava rests amid the Gothic architecture of a campus quad.