Children are wowed by the Kartchner Caverns just outside of Tucson. Among the most impressive forms in this state of natural wonders, the caves are a series of fantastic spires, columns, and surreal shapes. Millions of years in development, they join spots such as Cathedral Rock, Monument Valley, and Navajo Tribal Park as Arizona's most overwhelming sights. You can also enjoy hikes and horseback rides through the world's most stunning landscapes, including the 8,000 foot high Grand Canyon. Make sure to bring your camera! The world-famous road trip route, number 66, and the Grand Canyon Railway both run through Williams, where the nightlife pulses in the middle of the desert.