Just back from vacation in Cancun, MX. My wife and son along with Dan and Mo. We explored some ancient under ground rivers and caves filled with clear water. Called cenotes, they are filled with stalactites. Some are huge, others very small and all works of art. We also visited an ancient Mayan city called Chichen Itza. Amazing temples and ball court. If you ever visit this area of the world, be sure to explore these beautiful treasures. Adios.