Very interesting to see some of the people still thinks that earth is not flat. Of course it's flat. Look around, is there any slope around you? The highways, roads, buildings, everything is totally flat. 
I also don't believe the earth is spinning around the sun. If it spinned that fast, everything would move. The buildings would not maintain their stability. 
Yes, there is slope around me, but for fucks sake, Earth is fucking huge, you cant sense it in a 100 meters radius if you look around...
Believe it or not, the buildings are designed to maintain their stability. Also bridges. They have to defy the forces like the gravity for example. If the Earth would be flat, the gravity wouldn't exist, so WHY all buildings, bridges etc are designed considered the fucking gravity. Have you ever seen a blueprint in your life? Or a technical drawing? Architects using calcucaltions considering gravity to make that fucking building to stand.