Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Hammond_Building_postcard.JPG
The architectural work depicted in this photograph may be covered under United States copyright law (17 USC 120(a)), which states that architectural works completed after December 1, 1990 are protected. However, architectural copyright in the United States does not include the right to prevent the making, distributing, or public display of pictures, paintings, photographs, or other pictorial representations of the work. See COM:CRT/United States#Freedom of panorama for more information.
This law only applies to architectural works (such as buildings or other structures) and not other forms of 3D or 2D artwork such as sculptures, paintings, or posters. Images of these artworks taken in the US must be deleted unless they are in the public domain, or their presence is trivial.