Certain traditions prevail on the least-visited island of the Aran Islands.

A Neolithic passage tomb said to have sheltered two legendary Irish lovers.

A moody and picturesque riverside ruin overgrown with vegetation.

Huge standing stones mark a site of megalithic mystery.

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

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

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

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

Wander among the abandoned ruins of this once-powerful medieval town.

Ancient Bronze Age rampart that was used into the middle ages.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

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 ancient Irish tower could easily have stood in for Rapunzel's prison.

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

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

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

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

The inscribed stone at Kilnasaggart is a remnant from nearly a millennium ago.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

The remains of a 12th-century chapter house in Golden Gate Park.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.