Heritage Open Day: Local historian Ann Cullis will reveal some of the fascinating tales associated with the unique and historic building occupied by the Museum of Bath at Work - built originally as Real tennis court in 1777. The Museum of Bath occupies a building originally built for the playing of Real tennis in 1777. Since then the building has had many uses and is home to many stories and tales. From its use as an equestrian circus, a theatre, a school, pin factory, for political meetings and manufacturing.