This elaborate towering structure was once famed for its revolutionary height.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

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

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

A hugely vast Irish landscape of barren rock that stretches for miles.

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

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

"A hideous albatross in the Hudson River Valley."

The middle finger of modernity.

A 16th-century horror show built in a lovely Italian garden.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Medieval torture techniques with a modern conscience.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

This dramatic rail curve was once the target of a failed Nazi attack.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

The palatial McDonald's that inspired Wesley Willis.

A display of magnificent stained glass windows is the first exhibit of its kind.