This realistic landscape photo shows the Mayan ancient ruin El Castillo at Tulum, Quintana Roo, Mexico. The old stone Mayan building stands on the top of the limestone cliff along the Caribbean coast, covered with tropical native plants. Below are the clear gradient turquoise sea water and fine white sand beach, under the deep blue cloudless sky. Tulum is the only seaside Mayan ruin in the late Mayan civilization, it used to be an important maritime trade port for hundreds of years, now it is one of the most famous cultural landmarks on Mexico's Yucatan Peninsula.