One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

The largest whale museum in Europe allows visitors to walk among life-size giants.

Medicinal spa created with the discharge from a geothermal energy plant.

Three columns of volcanic rock shoot out of the ocean.

A winding, blood-red tunnel of hardened lava navigable by foot.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Walk in the footsteps of the gods and straddle two tectonic plates.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

The final resting place of the controversial chess champion.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

One of Ireland's most infamous prisons for rebels including men, women and children.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

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

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

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

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

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

The only monument to name all of the passengers and crew who died on the RMS Titanic.

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

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

The last Victorian market in Belfast.