The most important monuments are the pyramids they built in their religious centers and the palaces of their rulers. The palace at Cancuén is the largest in the Maya area. There are no pyramids in the area of the palace. Other important things the archaeologists found include the carved stone slabs usually called "stelae" (the Maya called them "tetun", or "tree-stones"). These slabs show rulers along with hieroglyphic texts describing their genealogy, military victories, and other accomplishments. In North America, they made Mississipian culture with the largest land field from around 800 CE to 1600. 