I wish there was a system where wonders could be destroyed by earthquakes, fires (only if they're flammable), storms, volcanos, enemies capturing cities (without razing, during brutal city sacking, yields some kind of treasure unit worth lots of gold and production), and also by their owners once obsolete (used to create production for other buildings as the wonder is slowly chiseled away). It would be much more realistic then the current system we have now as most of the real world's ancient wonders never survived to the modern age but rather were destroyed by all the above disasters I mentioned. To be honest this could also make quite the challenge when paired up with Deity or Nightmare mode. Would always keep you on your toes. Now this wouldn't be for everyone which is why I believe it should be a starting option called "Vulnerable Wonders", which would include both national and world wonders. However I suppose sub options could be created for those who only want national or world wonders to be vulnerable. What do you guys think? Good or bad idea?