Take a tour behind the closed doors into the archive store where around 100,000 individual items from the old Montgomeryshire, Radnorshire and Breconshire are stored.
Ewch ar daith y tu ôl i ddrysau caeedig storfa'r archifau lle mae tua 100,000 o eitemau unigol o'r hen Sir Drefaldwyn, Sir Faesyfed a Sir Frycheiniog yn cael eu cadw.