It is a typical public place of the Roman Empire where shows and games were offered. Some amphitheaters mentioned in The Urantia Book are:
In architectural spheres there are constructions of the same type:
- On Edentia, the amphiteater encircling the sea of glass, the receiving area of Edentia. 
- On Jerusem, the amphiteater encircling the broadcast-receiving station, with seats for five billion.