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

Ancient Bronze Age rampart that was used into the middle ages.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

The world's only flying boat museum honors a small Irish village that sent 20th-century aviation to new heights.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

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

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

This elderly couple's hand-picked collection of rare gems is one of the finest in all of Iceland.

A giant concrete orb in far north Iceland marks the ever-shifting boundary.

A classic carnival ride that was carved to be untouchable.

The famous 102-year-old circus elephant was struck and killed by lightning.

A working ranch doubles as a sustainable hub for world-renowned classical music and large-scale sculptures.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

This Old Testament garden features 100 plants from biblical times.

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

World's first "penitentiary," meant to be humane, drove men insane.

The ruined remains of a coal mining ghost town are hidden within the woods.

The remains of a deserted steamboat sit rusting beside an old ferry pier and an abandoned train platform.

A former hospital is now home to a pizza parlor and maybe a few ghosts.

This historic Ohio bridge is adorned with fanciful locks left behind by loving couples.