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.

A museum marks and documents the site of the Titanic's launch.

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.

Designed to commemorate the king's coronation.

Built into the wall of this pub is a unique marker detailing the distance to Dublin.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

A gated cross stands on the site where an Irish revolutionary met his end.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

This World War II relic let Allied pilots know they were entering neutral airspace.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large park in Dublin.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

A stunning medieval castle owned and restored by the famed actor Jeremy Irons.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

A former fortified tower now houses a collection of classic communications equipment.

An oddly conical beacon perched atop beautiful Irish cliffs.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

A massive Celtic cross secretly growing in an Irish forest.