User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-13471981-20140824141855/@comment-3046679-20140824172840

It's some sort of a data rift. I presume there will be a few of those, each having a different historical background. Presumably they're just there to break up the monotony of Paris-only landscape, since they're tiny areas designed for padding/data collection.