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.

The last Victorian market in Belfast.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

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

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

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

This beautiful site is where the first transatlantic telegraph was sent from.

The ruins of a medieval monastery named after a type of tree.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

A stunning Victorian abbey and walled garden on a lakefront.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A hugely vast Irish landscape of barren rock that stretches for miles.

An 1814 castle that hosts an exhibit of "explorabilia".

An Irish peat mine has become a stunning sculpture park.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.