The Mustard Museum in Mount Horeb, WI
The Toilet Seat Art Museum in Alamo Heights, TX
The Fastener Museum in Julian, California
The Museum of Bad Art in Dedham Mass
Liberace Museum in Las Vegas, Nevada
The Mutter Museum in Philadelphia, Penn. (includes "900 fluid-preserved anatomical and pathological specimens")
The Museum of Questionable Medical Devices in Minneapolis, Minn.
The Museum of Funeral History in Houston, Texas
The Lawrence Welk Museum in Escondido, CA [I included this for our Canadien friends]
The Toaster Museum in Charlottesville VA
The Burlingame Museum of Pez in San Francisco CA
The Squished Penny Museum in Washington Dc
The Museum of Menstruation and Women's Health in Washington DC
Though I didn't get my sites from the following web site RoadSideAmerica.com, you still ought to click on it, and select your state to see all the weird stuff that your state has to offer. Like Wisconsin has the World's Largest Replica Cheese and the World's Largest Talking cow. And New Jersey has the Death Rock of Alexander Hamilton. Waycross Georgia has the Petrified Dog in a Tree.
This next site is only a virtual museum, but I thought you all would like it anyway: The Furnace Sticker Museum