Currently demoing a bathroom in my house that is thought to have been built about 1910-1920 outside of St. Paul MN. While tearing up the bathroom I discovered that the baseboards are actually poured concrete (this is on the main floor, directly over the original cellar.) They are about 2" thick and definitely not just the plaster that has built up over the years.
Additionally, the entire room has a floor that is 6-7" of concrete. It's not level in the least and was poured around the plumbing service and then covered with 4-5 layers of tile/linoleum/vinyl/etc. Obviously the house has been updated/remodeled several times over the last 100 years but this is a "feature" that I'm very curious about. Was there ever a time that concrete baseboards and a concrete floor would have made sense? Was this house perhaps a workshop (and this design was to accommodate a specific function?)