Machu Picchu, the mountain citadel high in the Andes Mountains of Peru, is a familiar icon of the Inca Empire. Perched high on a steep and narrow ridge between two mountain peaks, the site is ringed on three sides by the Urubamba River, a dizzying 1,600 feet below.
Uluru, also called Ayers Rock, the iconic giant sandstone mound in Australia that rises abruptly out of an expanse of flat desert, has always intrigued me. For thousands of years the indigenous Australians have considered Uluru a sacred site, and it is the focus of numerous myths and legends. I understand that mythic attraction – and the geologic history is just as captivating.