The Mayan Tulum ruins site at Tulum, Mexico is great especially for those wanting a quick getaway to the beach also.
From the left:
1) The main temple at Tulum. 2) Closeup of Mayan face carving on one of the buildings. 3) The Tulum Temple seen from the side.
4) Most likely an administration building at Tulum, Mexico. 5) Another view of the Temple of Tulum.