A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

These barriers stand as stark reminders of Northern Ireland's troubled past.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

These murals stand as reminders to the troubled history of this Northern Ireland city.

A museum dedicated to the tragedy of Bloody Sunday.

An abandoned shipping control tower looks like a satellite perched at the end of a pier.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

This one has sailed five times as far as Sir Francis Drake's famous ship.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Pop culture has helped to keep this iconic British building from being destroyed.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

Giant, friendly pelicans in Central London, the most unlikely of places.

Scattered throughout London are ancient remnants of the city's former bounding wall.