The Catacombs in Palermo, Italy contain lines of thousands of well preserved corpses. Dating back to 1599 when priests mummified a monk for all to see and others followed. Some of the corpses have long ago lost their flesh and are skeletons. Others have mummified flesh, hair and even eyes. All are dressed in clothes from the period in which they lived. The practice stopped in the 1920s.
A fascinating website on the subject is maintained by retired US Navy Chief Petty Officer Kimberly King. Clicking on the title of this post should automatically link to her website. It is well worth a visit.