Commemorating the landing of William of Orange with his European army on their way to the Battle of the Boyne.

This giant sculpture is both loved and disliked by the local community.

The ancestral home of the 21st president of the United States of America.

Northern Ireland's Brobdingnagian stepping stones.

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

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

The atmospheric road was never meant to be so creepy.

The lake that fills and empties itself at random.

Amazing vistas await visitors to this stretch of coastline.

It is said a heartbroken man visited the gap every day to stare blankly out at the sea.

A harbor town pays tribute to a heroic wartime carrier pigeon.

This stone harbor was key to Carnlough's limestone industry.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Be(w)ar(e) the moat around this historic Czech castle.

Locals say the stone that marks the spot where the gallows once stood can lead you astray.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A quasi-futuristic roof sits atop a medieval Bohemian monastery damaged during World War II.

A Baroque mansion with ties to legendary magicians and alchemists.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

This spooky statue sits outside a famous Prague theater.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

Macabre astrological automaton clock dating to the late 1400s.

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

A 125-meter long "tribute to the Brazilian people."