Due to the lack of the wheel, Ancient Mayan cities were developed with backbreaking labor. They did have rope and a large assortment of stone and obsidian tools. Some scholars believe that the larger stones were rolled on logs and moved along river routes on barges. There are some records that indicate some heavy objects were moved on litters which were carried on the shoulders. Limestone is plentiful throughout Latin America and it was used in the construction of most ancient cities. Limestone, when put under intense heat can be made into stucco, plaster, and cement. Most commoners' homes were very similar to the ones that they live in today.