A showcase of canine neckwear spanning five centuries of doggie fashion and function.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

This ancient bridge made of stone slabs is said to be reserved for the devil to sunbathe.

This large neolithic tomb, also known as Greengraves, is hidden off a Northern Irish road.

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

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

The last working windmill in Northern Ireland.

This windmill was used for well over a century.

The easternmost point on the island of Ireland.

These huge glacial erratics are humorously named after a much much smaller bird.

From Vikings to nationwide rebellions, this castle has seen its fair share of warfare.

The stone that rocks no more.

This village provides a glimpse at rural life in Northern Ireland during the mid-20th-century.

This massive basalt sea stack stands obtrusively from the rocky coastline.

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

The enigmatic stone has towered over a Northern Ireland town for thousands of years.

This mysterious Bronze Age standing stone has become a place where couples profess their love.

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

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

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.

The atmospheric road was never meant to be so creepy.

This grave marks one of few bodies retrieved from the disastrous Franklin Arctic expedition.