Introduction to the Tulum ruins: The Tulum ruins are 130 kilometers away from Cancun. It is the best-preserved ancient Mayan and Toltec city in the territory, and it is also the only ancient city built on the seaside. The entire stone city was fully planned and reached its peak in 1200 AD. It is estimated that about 100,000 people lived there at that time. The largest buildings in the city are the Castillo Palace, the Temple of Advent and the Fasco Palace facing the coastal cliffs. The two-story Fasco Palace is also inlaid with breathtaking and magnificent murals.