This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

The largest spring in Northwest Arkansas is also home to a sprawling botanical gardens and a historically significant bluff.

From a canyon-like gorge, more than 20 million gallons of water emerge every day, while a smaller spring drips down, creating the illusion of an endless, gentle waterfall.

The modern birthplace of Irish freedom.

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

Experience what life was like in Ireland during the Viking and medieval ages.

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

A stunning Victorian abbey and walled garden on a lakefront.

This Neolithic passage tomb forms part of a World Heritage Site.

The ancient tomb acts as a calendar that keeps perfect time.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

A memorial for the mustachioed record-setting runner.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

Home to the only outdoor municipal elevator in the United States.

Home of Howard Hughes' Spruce Goose.

The wooden airship was the largest flying boat ever built.

World's largest porcine hairball sits in a collection maintained by Benedictine monks.