A little history, combined with natural fun! TULUM, The 'Walled City' is one of the most important archeological ruins in the area. Tulum is a spectacular Mayan city built in honor of the sun god, atop a cliff, overlooking the great Caribbean Sea, with one of the most interesting structures 'The Temple of Frescos.' This city within walls was only inhabited by the nobles, high priest and esteemed citizens such as astronomers. XEl-HA, (pronounced 'Shell-Ha') known as the world's largest natural aquarium is a vast area of protected inlets and lagoons, home for many varieties of colorful tropical fish. You can tube down a lazy river, jump into natural wells fed by subterranean rivers, swim in lagoons, or snorkel in springs. Dive in an underwater paradise where you can see turtles and dolphins. Relax on a floating bridge, in a Mayan cave or rest in a shady hammock. Immerse yourself here and now in a natural place of wonder.