At least all of the easily accessible areas with this criteria have probably been found, at least until someone comes through with a breakthrough in explaining something. Then again, geological processes are still at work as are other forces, and new things may be easily described (perhaps a city built on permafrost sinks, being a clear depiction of global warming). There's also much less accessible areas that would probable be able to give similar depictions. Satellite photography only really works on the surface of the ground (so underwater locations may remain hidden) and definitely can't see below the surface (so cave answers will remain hidden). Also, they need to be combed over in areas where vegetation might obscure things, or even considered  by someone who knows what they're looking for (especially with a satellite image).