A castle built for love, and abandoned due to heartbreak.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

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

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The modern birthplace of Irish freedom.

This small Irish village suffered the greatest loss of life when the Titanic sank.

A famed data visualizer's personal sculpture garden is a landscape of modern and megalithic wonders.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

Dispersed across 45-acres, 39 structures house a massive collection celebrating American Folk Art.

A 150-square-foot masterpiece of American landscape art is the crown jewel of this library and art gallery in Vermont.

A pair of black granite tails dive into a sea of grass in landlocked Vermont.

This railroad tunnel was once the longest in Massachusetts.

Once the largest gravity dam in the world.

The only surviving building of historic West Boylston, which was flooded to create the Wachusett Reservoir.

The ruins of a Massachusetts prison farm can still be found crumbling the woods of a state park.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

Garden dedicated to native carnivorous plants and site of huge flytrap heist.

Divinely-inspired village houses 6,000 dolls, plus strange and lovely outsider art.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.