The Cabildo, a very historical building in Argentina (where the decision to begin a revolution was made, amongst other things, although the building has been changed so much that there isn't really any of the original structure left!) has started sharing the troubles of the nearby San Ignacio church (the oldest church in Buenos Aires or Argentina, I can't remember). Due to its location over three subway lines and having numerous bus lines pass by it every day, a large crack has appeared in the wall, signalling trouble ahead. San Ignacio already has a street blocked off to accommodate a support structure, though this isn't possible for the Cabildo, which sits on the main plaza. Time will tell!