A magnificent winding road through a steep valley, with deep natural caverns at the bottom

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

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

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

A particularly disconcerting tribute to Irish martyrs.

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

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

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

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The modern birthplace of Irish freedom.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

The oldest continuously inhabited street in America.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

One man's swirling six-acre monument of stone.

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.