Although the ancient Maya built their cities many hundreds of years ago, they were such good builders that ruins of their cities remain today in Central America. The problem is finding them.
The Maya built their cities deep in the jungles and swamps. You cannot look for these ruins by air, because the dense jungle hides everything. Archaeologists have to enter the jungle on foot.
The jungle is a dangerous place. There are unfriendly natives, and poisonous snakes, and spiders and quicksand pits, and all kinds of nasty things. Yet, some archaeologists are so curious about the mysterious Maya that they are willing to brave the dangers of the rain forest.