Cobá
The ruins of a once-vast Maya metropolis can be found in Cobá, Quintana Roo, Mexico. The city's development is estimated to have started around 632 AD and peaked between 800 and 1100 AD. Although it is estimated that Cobá once covered a vast 60 square kilometers and housed up to 50,000 people, the current archaeological site has not yet uncovered all of its artifacts.
Even though Cobá started to collapse in the 12th century, it continued to be a significant location with buildings built and maintained at least until the 14th century and possibly until the conquistadors' arrival in the early 16th century, at which point it was abandoned.
Cobá is buried deep in jungle vegetation and is recognized as one of Mexico's more evocative sets of ruins. There are lots to explore; set aside half a day, dress in good shoes for climbing, and bring insect repellent.
Bike rentals are offered on-site, and there are cenotes nearby (approximately 7 kilometers). If you want to have some food or drink, the contemporary town of Cobá is only a couple of kilometers away. Cobá is one of the best ancient cities in Mexico.
Location: Macario Gomez, Quintana Roo, Mexico