Located inside Faro Celarain Eco Park [1], El Caracol is a small conch-shaped structure that dates to A.D. 1200. It’s believed to have been a lighthouse where Maya used smoke and flames to lead boats to safety.
Small openings at the top of the structure also acted as whistles to alert Maya to approaching tropical storms and hurricanes.
Admission to the reserve includes access to this small site.
Links:
[1] http://www.moon.com/destinations/cancun-the-yucatan/cancun-cozumel-and-the-riviera-maya/isla-cozumel/sports-and-recreation/faro-celarain-eco-park