Buddhist institutions are often housed and centered around monasteries (Sanskrit:"viharas") and temples. Buddhist monastics originally followed a life of wandering, never staying in one place for long. During the three month rainy season ("vassa") they would gather together in one place for a period of intense practice and then depart again. Some of the earliest Buddhist monasteries were at groves ("vanas") or woods ("araññas"), such as Jetavana and Sarnath's Deer Park. There originally seems to have been two main types of monasteries, monastic settlements ("sangharamas") were built and supported by donors, and woodland camps ("avasas") were set up by monks. Whatever structures were built in these locales were made out of wood and were sometimes temporary structures built for the rainy season.