The carriage house belonged to the Watson family and housed transportation vehicles from carriages to cars throughout its service. When the Erie County Historical Society owned the property, it also included the Erie Planetarium, a popular attraction. The Erie County Historical Society transferred the planetarium to Penn State Behrend where it is now called the Yahn Planetarium.
The carriage house now includes the Welcome Center/Gift Shop and a research library with more than 5,800 books published in the 19th, 20th and 21st centuries. The carriage house also provides the entryway into the new exhibit building which includes Frank Lloyd Wright’s San Francisco Office.
The Hagen History Center staff offices are located on the second floor of the carriage house.