Tex, did you take the pics with your own camera or were they got in the museum? If you took the pics, you own the copyrights, automatically. If the museum sold/gave them to you, they own them. No 'copyright note' needs to appear on any published work- copyright exists automatically. BUT: The actual museum itself, ie the exhibits and building or ideas, cannot be copyrighted. This is why a lot of locations like this try to ban cameras.
This area is a bit vague, in the sense that the internet operates worldwide, but copyright is vested in each nations' laws, based on the Berne Convention, but I believe you can publish pics to enhance your own description of something [ie not cribbing someone elses writing by copy/paste!] provided that the accompanying pictures are of minimum detail to enable the description to be fully understood. Since that's vague enough to get sued, take care!
What is certain is that you are safe posting copies of any material published in the US before 1923, anything published by the US Government [but not the US Mail for some reason], and any copyright owner's material, if they've been dead for at least 70 years.
Perhaps Bill/Mods would like to give us more guidance on this subject?
