Chestnut Hill Academy  Chestnut Hill Academy (CHA) was an all-male Pre-K through 12 independent college preparatory school located in northwest Philadelphia, Pennsylvania. Founded in 1861, CHA was the oldest all-boys school in Greater Philadelphia. CHA merged with all-girls Springside School in 2010 to become Springside Chestnut Hill Academy. The school's main building was at 500 West Willow Grove Avenue was formerly known as the Wissahickon Inn, now known as Springside Chestnut Hill Academy. Designed by G.W. & W.D. Hewitt and built by Henry H. Houston, the Inn opened for business in 1884. Houston also built the Philadelphia Cricket Club across the street, and additional land across the street played host to the Philadelphia Horse Show (now the Devon Horse Show). These were popular attractions for Houston's real estate development, and brought much business to the Inn. In 1897, the Inn's business began to decline when the Philadelphia Horse Show moved, and improved transportation caused guests to seek more distant travel spots. In 1898, Chestnut Hill Academy moved to the Wissahickon Inn from its previous residence on 8030 Germantown Avenue. The school and the Inn functioned simultaneously, the school making use of the inn's facilities during its off season, and the Inn doing business when students had gone home for the summer. The Wissahickon Inn closed in 1901, and Chestnut Hill Academy took permanent possession of the property. The Wissahickon Inn is listed on National Register of Historic Places, and the school retains many of the Inn's original structures today.