Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Home to three historic ships from the age of Vikings.

A ruined priory that was once a favorite pilgrimage site for English kings.

One of the best preserved Tudor public buildings in Britain was once used for witch trials.

This massive metal scallop is a tribute to an English composer who once walked across this beach.

An 18-meter-long sarcophagus of a constantly growing dead prophet.

Light still pours into the ruins of this ancient Islamic observatory.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

Traditional 11th-century outdoor tannery.

The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This enormous censer uses a pulley system installed over 400 years ago.

A clock designed to run with perfect accuracy for 10,000 years.

This museum inside a museum tells the story of London's timepieces.

The extra platform at Gloucester Road has been used for art displays for over 25 years.

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.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

Tucked away behind the mansions of Mayfair, this picturesque garden is a hidden London treasure with a spooky past.