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

The lake that fills and empties itself at random.

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

The ruins of a once-grand mansion in Northern Ireland are now thought to be haunted.

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

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 Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

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.

This windmill was used for well over a century.

Legend says the water within these mysterious sacred springs stays cold even when boiled.

A medieval abbey featured on 'Game of Thrones' that dates back to the 12th century.

A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

A six-ton wedding present for the King of the Scots.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

The most loyal of little dogs, or a Victorian era publicity stunt?

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.