Arches National Park is located just outside the town of Moab in Utah. The park has an incredible amount of beautiful red rock formation, from thin arches, to massive thick arches, to balancing rocks to wonderful narrow passages. The park is open 24 hours and it is a great place to stargaze and astrophotography as well due to the low light pollution. To visit the entire park takes at least a couple days. It is a photographer paradise, due to the incredible colours of the rocks, the desert and the clean crips air.
For more information here is the link of the US National Park Service.