This picturesque lighthouse at the edge of the Irish Sea looks like a giant stone pencil.

These sculptures honor the knights who once called Carrickfergus Castle their stronghold.

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

This massive monument has been telling the time for 150 years—at a slight angle.

A replica memorializes the site where women were punished after the last witchcraft trial in Ireland.

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

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

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

The statue honors a beloved bird that once roamed St. George's Market.

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

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

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

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

A miniature train-ride through Slovenia's largest cave system.

A whimsical bridge adorned with decorative dragons.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Where Venice's gondolas go for a tune-up.

Two stone columns flank the grand Venice square, but there were supposed to be three.