The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

The sprawling attraction boasts a collection of more than 150 historic wagons.

Despite a recent paint job, the factory still sits empty.

A petroglyph purportedly left by the first European to enter Arizona

A self-built castle made by a mysterious man.

A historic hydroelectric power plant serves as the unusual backdrop for a public park.

The unusual burial monument of Arizona's first governor.

A tribute to one of the last great singing cowboys.

Previously a hot spring, this park remains a site of unique history, wildlife, and geology.

A Civil War Museum with some notable medical antiques.

Historic barracks utilized during both the Revolutionary War and the Civil War.

A museum marks and documents the site of the Titanic's launch.

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.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

Northern Ireland's Brobdingnagian stepping stones.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

This reconstructed Norman castle is the world's most accurate, from location to livestock.

An ambitious developer built what was once the world's tallest fountain in a Phoenix suburb.

One man spent decades making these working scale models of antique cars.