Here's what travelers should know about cenotes, including where to find them in Mexico, whether people can swim in them, and their history with the Mayans.
Cancun joins forces with Yucatan research center for cleaner cenotes riviera-maya-news.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from riviera-maya-news.com Daily Mail and Mail on Sunday newspapers.