What is causing the strange lighter circles in images taken with my Canon 15-85?

I took these pictures with my Canon EF-S 15-85mm f/3.5-5.6 IS USM lens this morning:

Would somebody please tell me that what is that white part in the lower right corner of the picture?

EXIF info:
F/8
ISO 100
1/125sec
Focal Length : 85mm

And what are these circles in the center of this picture?

EXIF info:
F/8
ISO 100
1/125sec
Focal Length: 15mm

Thanks