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Photo: Smallbones, Public domain via Wikimedia Commons
Definitely bigger and fancier than your average Historical Society Museum. One of the buildings was originally an opera house designed by the same architect who designed the capital dome in Washington, DC. Not as good as a Smithsonian or something, but if you're into history at all and you're in the area, it's definitely worth seeing. Genealogical and newspaper records at the library are very comprehensive.
Chester County History Center (CCHC), formerly the Chester County Historical Society, is a nonprofit historical society, founded in 1893, dedicated to collecting, preserving, and exhibiting the history of Chester County, Pennsylvania, and the surrounding area. The History Center is located at 225 North High Street in downtown West Chester.
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A sight to see. It is one of the most historic buildings in the town. William Penn established Chester County as a member of the three first counties of the Colonial Pennsylvania in 1682. In 1724 a courthouse was built near the Delaware River in Chester. Because of population growth the courthouse moved inland into West Chester. A court house was constructed between 1784 and 1786 on High street in the middle of West Chester. This establishment is listed on the National Register of Historic Places.
An aviation museum devoted exclusively to helicopters. They collect, restore and display historic aircraft and chronicle the origin and development of rotary wing aircraft. This museum can be interesting to actual pilots down to people who know nothing about helicopters.