Definitions for "Amphitheatre"
An oval or circular building with rising tiers of seats about an open space called the arena.
Anything resembling an amphitheater in form; as, a level surrounded by rising slopes or hills, or a rising gallery in a theater.
An oval open-air arena surrounded by seats. It was invented by the Romans for public shows, such as gladiators fighting to the death and battles between wild animals.
Keywords:  wonder
i wonder...
Basin shaped hollow, particularly one having steep sides. Considerable variation in size.