A Nesting Doll of Churches.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

Geothermal waterfalls in Tuscany.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

A wonderful safe haven founded in the 1960s to rescue endangered monkeys from the pet trade.

An avant-garde artist is survived by his seaside garden.

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

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

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

Cliffs full of fossils at the portal to England's Jurassic Coast.

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Pop culture has helped to keep this iconic British building from being destroyed.

This secluded walkway overlooks a magnificently wild London green space.

A Roman spa buried deep beneath the City of London.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.