Listed Buildings and Treasures

#238 The importance of #preservation. This and another identical entrance are part of a building which was known as the Derby Royal Infirmary. It seems a little odd to leave such a small part and yet these where the only elements which were #listed. How is it decided which buildings, or in this case parts of buildings, are important enough to preserve? Is it similar to how we choose which objects from our lives to treasure perhaps? Or memories? Or experiences? What would your listed objects/memories/experiences be? What would you discard?