Amongst the most gorgeous destinations in Jerez de la Frontera is the interior of the cathedral. You may enter the cathedral to get a price of 7 EUR (see timetables and prices in this article) and afterwards investigate the cathedral, and the many hidden corners (just like the Treasury) https://andreqwyoy.thelateblog.com/27089542/new-step-by-step-map-for-jerez-de-la-frontera-hogar-de-videntes-extraordinarios