A Buddhist temple to honor insects that died for science.

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

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

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

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

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

Experience what life was like in Ireland during the Viking and medieval ages.

A remarkably intact castle that once was the largest in Ireland.

A moody and picturesque riverside ruin overgrown with vegetation.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

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

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

An abandoned 14th-century castle and prison complex on a small island in the Neva River.

What was once the base for Russia's first nature reserve is now a ghost town, right on the shore of Lake Baikal.

Site of the world's largest nuclear explosion.