I was approximately 12 years old when I saw this UFO. I haven't told a lot of people about it. I thought because I was so young at the time that no one would have believed me. Anyway, we lived in a hotel in downtown Denver. I had stayed over at at friends house and had ate supper with his family. Anyway when I headed for home I had to walk past the City and County Building. It looked like it was going to snow, the clouds were real thick and hanging low. As I walked across a the light by the City and County Building all of sudden out of the clouds came a fireball shaped like a basketball. It appeared for several seconds and then went back into the clouds. I thought it was so odd because it was so cloudy. I don't know if anyone else had seen this to this date.