Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

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

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

A tunnel with windows, so you don't miss out on the impressive views.

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