I recently found that the sculptures in Chicago's Millennium Park are copyrighted which means you can't photograph them:
"The copyrights for the enhancements in Millennium Park are owned by the artist who created them. As such, anyone reproducing the works, especially for commercial purposes, needs the permission of that artist."
link to full article
And photographing the Eiffel Tower at night is illegal as well as Christ the Redeemer is such (nearly):
Eiffel Tower: Repossessed
Famed statue is at heart of copyright fight
Okay that's all perhaps mostly for commercial use.
But I've noticed as long as I photograph that a lot places forbid private photographing, because they want to sell there own stuff. (The most funniest explanation for this I got in the stalactite caves in our neighbourhood: photographing would disturb the animals down there - they must have evacuated them, when taking there own some hundred photos.