The Anthracite Heritage Museum Reopens for Charter Day The Anthracite Heritage Museum will be open and free to the public in celebration of Charter Day on Sunday, March 12 to celebrate the 342nd anniversary of Pennsylvania’s original charter.The Anthracite Heritage Museum will offer free admission and a special presentation of a film by the Underground Miners. The film features a 30 minute conversation with nonagenarian anthracite miner Phil Voystock. It will run each hour. These events are part of the Pennsylvania Historical & Museum Commission’s Charter Day event, when museums and historic sites throughout Pennsylvania celebrate the Commonwealth’s birthday with free admission and special programs.