Starting to plan our trip to Mexico in May and I'm getting all excited just thinking about everything I want to pack into such a short time. At the top of my list: cenotes. They're basically natural sinkholes caused by the collapse of limestone bedrock, revealing wells of fresh groundwater, and are often connected to one another by seemingly endless tunnels. Underwater underground labyrinths. So cool, right? One of the natural wonders of the world (at least, they would be if I were in charge of making the list).
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