Achaeologists say they have discovered hundreds of Mayan artifacts and burial sites, along the route of a train construction project in Mexico's Yucatan Peninsula.

Researchers have so far discovered nearly 2,500 pre-Hispanic structures, 80 burial sites and thousands of vessels and fragments along the route of the "Maya Train," Mexico's National Institute of Anthropology and History (INAH) announced in a statement Thursday.

 Preliminary analysis indicated the Maya had inhabited the area for a long time, from the Middle Preclassic Period -- which began in 700 BC -- to as late as 850 AD, the end of the Late Classic Period. 

 "Both the immovable archaeological artifacts and the movable ones expand the knowledge about daily life, and trade and cultural exchange relations that existed centuries ago in the Mayan area," the researchers said.

https://www.cnn.com/style/article/mayan-civilization-artifacts-discovery-train-mexico-scn-scli-intl/index.html

and when looking up info on what was found by the railroad effort, I found that in Guatemala they found the below pyramids:

advanced laser mapping has revealed more than 60,000 ancient Mayan structures beneath the jungles of northern Guatemala. Set across dozens of hidden cities, the discoveries include houses, palaces and a 90-foot-tall pyramid that was previously thought to be a hill.

https://www.cnn.com/style/article/ancient-mayan-structures-discovered/index.html