Tikal National Park was once the home of one of the largest Mayan city states. Seeing the temples and other structures for yourself is a must do if you ever have the chance to visit Guatemala. Besides the temples themselves, the park is full of different types of exotic wildlife. Many of the temples allow visitors to climb them, providing stunning views of the Guatemalan jungle that has overtaken the area. I visited Tikal during my first trip to Central America. You can read the official descriptions from the World Heritage website here.