Along with its superb geological and natural history collections, the Yorkshire Museum contains many important Roman and Anglo-Saxon archaeological artifacts. It's also where you'll find the 1,000-year-old Cawood Sword, the best preserved such Viking weapon in the world. 

Medieval sculptures and utensils are exhibited in St. Mary's Abbey. Be sure to spend time in the lovely - and free - Museum Gardens. Extending across some 10 acres in the heart of the old city, this beautiful garden is home to more than 40 species of birds, as well as trees, shrubs, and flowers under the ruined walls and arches of the medieval St.