The first declared National Monument in the United States.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

The attic of a four-century-old canal house hides a clandestine church.

A unique bridge with an equally unique view.

The fairy tale castle of the "fairy-tale king."

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

This memorial was created by an Irish nurse who lived in New York City during 9/11.

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

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

An unusual manor of stunning beauty, born out of a crippling disease.

The house where the writer spent his formative years.

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

According to the legend, this strikingly beautiful hill has miraculous healing powers.

A unique botanical garden housed in three giant geodesic domes.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

Every president in history is immortalized in bronze in downtown Rapid City.

This small piece of Michigan is entirely surrounded by Ohio.

Deep scars on the earth left by the Ice Age.