A memorial dedicated to a tragic World War II aviation accident.

Though it looks like a golf ball teed up for a hit, this hilltop station is actually used to monitor air traffic.

A square stone tomb marks the spot where six men were killed while holding a service in Caldoris Wood.

The ruins of a 12th-century seaside castle on the southwest coast of Scotland.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

A roadway designed for a visiting monarch.

The site is dedicated to an investigative journalist whose murder triggered a political uproar that changed Slovakia forever.

A single oak tree rises out of the waters of Loch Lomond.

This mural condenses 96 miles of one of Scotland's best-known trails into a unique art display.

Soon after its unveiling, this giant inverted globe sparked controversy and was vandalized.

This sculpture encompasses the emotion of rail travel.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

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

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

This tidal island, a sacred site in early English Christianity, was the target of a notable Viking invasion.

Down a pint of ale where the Bishop of Ely's servants slept in 1546.

Mountain where Jesus was first tempted by the Devil.

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

According to the local legend, these boys and ducks were turned to stone by an angered water goblin.

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