large triangle shaped object wiith 3 bright lights

I was about 11 yrs old my neibhor and me were riding our bikes on a service road along hwy 10 just south of Rice, Mn. When the air became calm and silent we had stoped to chat, when behind us coming from the west were 3 bright rotating lights forming a triangleir shaped abject slowly approching us and stopped, this thing was huge in size and quite not even a whirl buzz or humm just silent, We could see the outlne of it, It had to have been over 75 from one point to the next. (The craft was rounded att all 3 points) and what looked to be about 20 feet tall, It almost looked like there were windows all the way around it it sat there for about 30 seconds (seemed like about 5 minutes) then rapidly took off to the northest and gaind altitude until it disapered. we looked at each other in shock and as fast as we could took off for home and never mentioned a word to anyone til this day