Anyone who's known me for the last few years probably knows that Mexico is my favorite place to travel around. Tacos are a big reason why. And then there's the fact that you can go from Bar Americas to Teotihuacan to swimming in underground caves ike this one without leaving the country. Apparently, some of these cenotes were also used by Mayans as sacrificial grounds. So I wouldn't recommend swimming too far into the dark spots of the Yucatan cenotes unless you want to be greeted by some skeletons.