KV19
Luxor, Egypt
Tomb KV19, located in a side branch of Egypt's Valley of the Kings, was intended as the burial place of Prince Ramesses Sethherkhepshef, better known as Pharaoh Ramesses VIII, but was later used for the burial of Prince Mentuherkhepshef instead, the son of Ramesses IX, who predeceased his father. Though incomplete and used "as is," the decoration is considered to be of the highest quality.
Monument data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).