"We gonna rock down to Electric Avenue, and then we'll take it higher..."

This secluded walkway overlooks a magnificently wild London green space.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

St. Augustine's record-setting narrow street was designed to protect against pirates.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Location of a reliquary containing bone fragments of 18 saints.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The Emperor Tiberius' palace of debauchery.

Pompeii's less famous neighbor is still revealing her secrets.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The celebrated eyesore created by starry-eyed sweethearts.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.