Question

am·phi·the·a·ter
  (US)   ( or chiefly Brit   am·phi·the·a·tre) /ˈæmfəˌθiːjətɚ/  noun  ,  pl   -ters [  count  ]
  1 : a large building with seats rising in curved rows around an open space on which games and plays take place
  2 : an area of level ground surrounded by hills
   a natural amphitheater