I don't know about Ancestry, I'm not a subscriber. I just noted for Familysearch that their non-US locations are very limited historically and still aim at following the US model: town, county, state, country, whether it makes sense or not. German towns pose a problem because in the 1970's there was a massive consolidation with numerous mergings, incorporations etc. that made a lot of historic locations disappear. Counties are probably even worse with respect to changes.