Wikimedia Commons has media related to Monuments and memorials.

Monuments and memorials are objects that commemorate something, usually a person, a group of people or an event. Popular forms of monuments and memorials include statues, obelisks, landmark objects or art objects such as sculptures or fountains.

(Note: Although monuments and memorials in the U.S. include National Memorials like the Washington Monument, this category is not meant to describe various natural park–type places, such as Devils Postpile, which happen to be given the legal name "National Monument" for reasons unrelated to any memorial.)