Ok. I looked at the pavilion picture... it is tilted to the right, but very little, around 1 degree.
It may look much more tilted because the water edge of the reservoir is not perpendicular to the direction of the camera angle. Also the buildings are no help because the ones on the left are nearer, and they are of different height.
Another issue, there seems to be a little keystone (perspective) distortion as well and that was not taken care of properly... that made the outer pillars (especially the big one on the left) lean in, making the picture look more tilted that it is.
So, it is tilted, but only a little. But the way the composition is done, and the keystone distortion, made the whole picture looked a lot more tilted than it is. The way to fix this picture, is actually to shoot it much wider. So some of that effect is minimized.
Good to see so many of you are becoming verticals police... Will become good lanscape and building photographers... but also, remember to take it easy a bit... after all, it is just a picture. Well done folks... keep up the good work.