Machu Picchu consists of around 200 buildings. The more important buildings, such as temples, generally have masonry consisting of very large, heavy, perfectly formed blocks or regular shape. The less important structures, such as the one seen in this photograph, still have remarkable stone work; however, they are made of smaller stones and sometimes make use of mortar. Because Peru is a highly seismic region, doors and windows in Machu Picchu are often trapezoidal to help prevent them from collapsing.