The National Music Museum in Vermillion, SD is part of the University of South Dakota and has a collection of more than 14,500 musical instruments.
There are lots of guitars. Here's a whole room full.
I thought this harp guitar was interesting.
Here's a guitar that was autographed by B.B. King for the museum. It's a Gibson, Artist Collection "Lucille". You can read about how B.B. King named his guitars "Lucille" here.
There's a room full of keyboard instruments.
I liked this banjo made of a baseball bat and Chevy Camaro hubcap.
Here are two of the 4 instruments made by Antonio Stradivari in the museum. The violin, on the right, was made in 1693.
This trumpet, made in Hollywood in 1978, was a prop for the movie "Sergeant Pepper's Lonely Hearts Club Band."
There are lots more interesting instruments in this museum. You can see pictures and descriptions of many of these instruments on their website here.
This museum is in a lovely area and worth a visit if you're ever in the area.