A historic and oft-filmed prison stands in a Chicago suburb.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

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

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

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

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

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

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

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

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

Huge standing stones mark a site of megalithic mystery.

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

A gated cross stands on the site where an Irish revolutionary met his end.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

This single room has survived the centuries with almost no deterioration.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

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

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

A moody and picturesque riverside ruin overgrown with vegetation.

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

A giant roll of mints marks the birthplace of one of America's most famous candy brands.

A standing relief of a Norman knight whose posture marks him as a Crusader.

This 14th century tower house was once the home of Irish poet W.B. Yeats.