The Mayan Ruins of the Yucatan Peninsula are truly a treasure to behold. These lost cities hail back to as many as 2,000 years ago, when the Mayas were practicing such mathematical genius as astronomy and physics, long before the white man had figured out the secrets. Nobody knows what happened to the Mayas, but their legends - and their cities - live on to this day. Every visitor to Cozumel should visit Chichen Itza, Tulum, or Coba Mayan ruins at least once on their vacation. This is something truly unique to this region, and the stories that these ruins tell will move you.
A: Chichen Itza was just named as one of the 7 wonders of the world. Every visitor to the Yucatan should see this impressive site. Tulum is smaller, but it is much closer (45 minutes vs. 2.5 hours), and has a breathtaking clifftop setting overlooking the Caribbean Sea. Coba is the largest site, but is only partially restored. If you don't have time to go to the mainland, or are on a cruise ship, then still consider San Gervasio - the tour is an interesting look at the Mayas, even if the ruins are not nearly as large or impressive as those on the mainland.