These imposing walls and towers look more like the ruins of a fortress than a monastery.

The house where the writer spent his formative years.

The ruins of a medieval monastery named after a type of tree.

The oldest public library in Ireland.

An ancient neolithic tomb that only sees the sun twice a year.

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

A moody and picturesque riverside ruin overgrown with vegetation.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The remains of a former logging boom town, crumbled away in the forest.

Over 75 historically themed murals grace the walls of a small Washington city.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

These mid-century motels once housed the workers who built the Glen Canyon Dam.

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

This collection of neon icons is preserving Arizona's history, one sign at a time.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

A mysterious "wedding cake" castle in the middle of the urban desert.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

A spiritual vortex among the red rocks in Sedona.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A sharp bend in a dramatic river canyon cut through red rocks.

Rippling sand dunes frozen in the Arizona rock.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.