Perched on a limestone cliff 12 meters above the turquoise Caribbean Sea, the walled Maya city of Tulum is the only major archaeological site in Mexico built directly on the coast, and the views alone make it unforgettable. The compact ruins date primarily to the 13th through 15th centuries, when Tulum served as a major trading port for the Post-Classic Maya civilization. The centerpiece is El Castillo, a watchtower-temple whose silhouette against the impossibly blue water has become one of the most iconic images of the Mexican Caribbean. Surrounding it are the Temple of the Frescoes, which still bears traces of elaborate murals depicting Maya deities, and the Temple of the Descending God, adorned with a distinctive upside-down carved figure.

What makes Tulum uniquely appealing is the combination of archaeology and natural beauty. A wooden staircase descends from the cliff-top ruins to a crescent of white sand lapped by crystalline water, where visitors can swim beneath the ancient walls — an experience available at virtually no other archaeological site in the world. Iguanas bask on the warm stones of the temples, pelicans dive offshore, and the jungle presses close on three sides, reminding you that this coastline was once the frontier of a vast trading network stretching across Mesoamerica.

Pro tip: Arrive at 8:00 AM sharp when the gates open to have the site nearly to yourself before the tour buses from Cancun and Playa del Carmen arrive around 10:00 AM. Bring your swimsuit under your clothes so you can take a dip at the beach below the ruins — it is one of the most memorable swims you will ever have.