The Leaning Tower of Pisa in Italy leans at a 5.5 degree angle. On the right side of the picture, the tower makes an 84.5 degree angle with the ground. On the left side, the tower makes a 95.5 degree angle with the ground. Those two angles are supplementary because their sum is 180 degrees.
Photo courtesy of Felix Just S.J. Look at more pictures on the site of Felix Just S.J.