Biggest Ship Ever

Hello,  Now I know this is should be a recent sighting, but this one is a Biggie.  What I mean is it was Hugh.  Bigger then any I have ever heard of. 
My Father and I were traveling in a caravan on a move from Carson City, Nevada to Oklahoma.  About 200 miles from Las Vegas I guess,  We seen a Very Large Craft Hover up from Behind a small mountain range to the east of us, the best I can describe it was that it was like 2 tops off a football stadium flipped to make a ship, big, silver metallic with a lot of tarnish or a rust discoloration, a weathered look to it. with structure protruding from it on the side facing us, very much like the UFO's seen in ID4 only silver with tarnish all over it. It came straight up above the Mountains then back down a little back up then all the way down disappearing behind the mountains, I suppose it was somewhere around Area 51, yet I don’t know if it existed then, It looked very heavy no exhaust seem to be coming from it, I cant remember if it had any lights, but I want to elaborate it was real big, actually bigger then the top of a foot ball stadium big. I’m sure even with the best of our technology at that time we had nothing of that scale, and why would we? I am sure it was not a balloon or anything like that. I wanted to share this with you for I have been seeking a similar story to no avail. And was hoping someone might have a story that mimics mine. Well Good hunting, also was wondering why there never seems to be any real good UFO pictures? What gives, someone with modern Cameras needs to be out there photographing them.
Thanks, ((name deleted))
Witness indicates that the date of the event is approximate.  PD