I was mowing grass when I noticed a bright large star in the nw sky about half the size of the sun it started getting smaller and before it disappeared a object came out of it. It kept getting closer and getting larger as it came my direction it moved slow and by the time it got even to me I was facing north and it was about 1000 feet above the trees but it was so huge it didn't matter. It was round with a clear dome inside the dome were skyscrapers of all sizes I could see Windows on them. The middle was solid of black it had circles which looked like could be doors of some sort and the middle part had large long antennas is what they looked like , but from the bottom of this craft hung another city not covered by a dome large skyscrapers again. But as it moved slowly in front of me it suddenly disappeared I kept watching and about 30 seconds later it reappeared just a little further to the east in its straight line path it stayed visiable for another minute then disappeared again and I didn't see it again after that.