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

The highest peak in Northern Ireland is topped with a stone tower and haunting burial mounds.

A retired military stronghold on the rolling green coast of Donegal.

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

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

A peace symbol in Northern Ireland is among the world's largest hedge mazes.

A massive Celtic cross secretly growing in an Irish forest.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

Designed to inspire artists visiting the island.

A beloved upside-down beacon off the coast of Northern Ireland.

A museum dedicated to the tragedy of Bloody Sunday.

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

Beautiful scenery provides the backdrop for an abandoned coastguard facility.

A Victorian marvel of engineering is now a 21st-century tourist attraction.

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

Northern Ireland's Brobdingnagian stepping stones.

This Victorian-era walkway is just one of the many 19th-century treasures in Whitehead.

Dedicated to preserving railway history from across Ireland.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

The stone that rocks no more.

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

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

A restored World War II Churchill Mark VII Tank now stands guard in Carrickfergus.

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