Brookside Natural Amphitheater ID: 5906 | This file appears in: Amateur Baseball at Brookside Park The natural amphitheater at Brookside Park was dedicated as a stadium in 1909. A circular tract was graded at the foot of the hill near Denison Avenue, and an embankment filled along nearby railroad tracks. The following year, an ordinance was passed by the city to begin construction on a section of concrete seats. | Date: ca. 1909 | Source: Cleveland Public Library Photograph Collection Download Original File SourceCleveland Public Library Photograph CollectionDateca. 1909 "Brookside Natural Amphitheater" appears in: Amateur Baseball at Brookside Park