Stadium

This is a large, sunken, Greek like arena outdoors where camp meetings take place and competitions and things can be held. It is made of solid concrete with many, many rows of benches stretching away from the center. The center is as big as a football field. It can be modified at any time, to what it is needed. It can be completely flat at one minute, or full of trees, or full of rivers. It all depends on what the event is. At any given time, however, it is usually just flat earth at the bottom. It is open at all times.