Cannabis October 12, 2016 thcscience_admin Pages in category "Museums in Powys" The following 11 pages are in this category, out of 11 total. This list may not reflect recent changes. A Abbey Cwmhir HallB Brecon CathedralG Y Gaer (cultural hub)N National Cycle MuseumO The Old Bell Museum Owain Glyndŵr's Parliament HouseP Powis CastleS Shire Hall, Presteigne Regimental Museum of The Royal WelshT Trefeca Tretower Court