The only medieval bridge in Britain with its defensive tower still in tact.

The castle still holds traces of the abandoned Roman fort it was built atop.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

Famously misunderstood wonder of the ancient world

The longest hedge maze in the world.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The celebrated eyesore created by starry-eyed sweethearts.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An ethereal glowing blue ocean cave in Croatia.

An ancient octagonal weather station named for the eight Greek gods of wind.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This beautiful, historic church looks like something out of a simpler past.

This stunning concert hall has become a symbol of Iceland's national recovery.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Medicinal spa created with the discharge from a geothermal energy plant.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

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

A quaint hamlet of nine cottages around a small green near Blaise castle.

The Bristol Camera Obscura housed in an ancient windmill.

Banksy's image of a naked man dangling from the window of a sex health clinic.

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.