Leah Hogsten, The Salt Lake Tribune/AP
Posted signs detail restrictions on those entering Recapture Canyon in Utah. The Bureau of Land Management closed the canyon to motorized vehicles in 2007. Recapture Canyon is home to dwellings, artifacts and burials left behind by Ancestral Puebloans hundreds of years ago before they mysteriously disappeared. Environmentalists and Native Americans say the ban is needed to preserve the fragile artifacts.