A place of worship is a specially designed structure or consecrated space where individuals or a group of people such as a come to perform acts of devotion, veneration, or religious study. A building constructed or used for this purpose is sometimes called a house of worship. Temples, churches, and mosques are examples of structures created for worship. A monastery, particularly for Buddhists, may serve both to house those belonging to religious orders and as a place of worship for visitors. Natural or topographical features may also serve as places of worship, and are considered holy or sacrosanct in some religions; the rituals associated with the Ganges river are an example in Hinduism.