Chichen Itza has a name from the meaning "From the mouth at the well Itza." The monuments were built over a series of years, perhaps as long as 1,000 years. The most famous structures are El Castillo, the stair-stepped temple; El Caracol, a circular observatory; and the Temple of the Warriors. If you want to know know more about these ruins, the daily tours are an excellent way to get to the know the site. A guide can fill you on on the history and story of this singular place. The on-site hotels have guided tours as part of their amenities.