The American Sign Museum in Cincinnati (https://www.americansignmuseum.org/) is good if you like neon and advertising. They have an on site shop where you can view repairs being performed.
The Boneyard in Las Vegas is also worth seeing. It was featured in one of the Danny DeVito scenes in Mars Attacks.
They claim average household income of their readership is $550k, which for a magazine for the South is, wow. They're really targeting the regional top 1% there.