A remarkably intact castle that once was the largest in Ireland.

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

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

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

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

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

The highway's southernmost spot is a beloved local attraction.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

Former villa and estate of James Deering developed to preserve native tropical forests.

In memory of the 110 victims of ValuJet Flight 592 that crashed in the Everglades.

Dedicated to the victims of one of the deadliest hurricanes to strike the United States in recorded history.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A monument celebrating the idea of reaching inaccessible places.

Once an ancient sea, this landscape of rocky ravines is filled with the fossils of ancient marine life.

A wonderful collection of all things Oz is nestled in the heart of Kansas.

A monument celebrating the Black soldiers of the 9th and 10th Cavalry.

This recently restored timepiece has stood all around Kansas City.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

A beloved, quirky little fountain featuring a large frog spitting water at a naked boy.

This giant green head remembers one of America's jazz giants.

This otherworldly church spire reaches up toward the heavens.

A steeple that now houses a small church.

According to folklore, Vermont's slanted windows were installed to keep witches from flying into the house.

A town wears its heart on the sleeve of a smiling girl, arms flung wide open in a cheerful greeting for all who encounter her.