A small but stubborn relic of Spain’s turbulent past hides in plain sight.

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

This network of narrow, medieval passages has the most delightful name.

A six-ton wedding present for the King of the Scots.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

A never-finished memorial to the heroes of the Napoleonic War has become "Scotland's Folly."

A hugely vast Irish landscape of barren rock that stretches for miles.

Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

Though they've since been renamed, these two streets hint at Dublin's darker days.

A small but charming botanical garden that contains many exotic plant species.

A hidden three-foot-wide house separates these two regal churches.

Solitary monument dedicated to the beauty of nature.

Museum precariously perched on a massive yellow pillar.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

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

Ancient catacombs form the foundation for this Rococo orgy of a church.

The stunning interior of this Gothic church is covered in ornate gold details.

Sip cherry liqueur at a bar dating back to 1840.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Go surfing on this urban wave, "hacked" by local surfers.