A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

The world's only surviving heavy cruiser has a haunting history.

Money may not grow on trees, but it can be dispensed by one.

Dedicated to a local cow who escaped a slaughterhouse and became an international symbol of peace.

Dedicated to the neverending mathematical constant, this plaque next to a park bench was sponsored by an anonymous benefactor.

The ruins of a monastery that dates to the 7th century.

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

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

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

These imposing walls and towers look more like the ruins of a fortress than a monastery.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

This natural sea arch highlights Ireland's rugged coastal beauty.

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

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.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

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

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

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

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

A more than 260-year-old crypt built on Boston's oldest English burial ground.

The former locus of Boston's high culture has been shuttered and buried for over 70 years.