A bridge of shoals found between India and Sri Lanka, called Rama sethu. The image was taken by a passing NASA satellite. The bridge has been said to be constructed at the time of the great Hindu epic Ramayana.
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]