Concert hall
Some concert halls are purpose-built.  That means they were built to be concert halls.  Other concert halls may have been something else many years ago, e.g. a Corn Exchange (a place where farmers used to sell their corn) and the building has later been changed into a concert hall.  Purpose-built concert halls started about the beginning of the 20th century.  At that time scientists began to understand the importance of good acoustics (somewhere where the sound was good).