Last time I went there it was in Mount Horeb…guess it’s been a few years.
There’s also an Edison Museum in West Orange, where he moved after Menlo Park. It’s a national park, and has all sorts of cool Edison stuff. I really should visit more often than I do, it’s basically 5 minutes from my house.
And then there’s Edison’s old workshop etc. (including Edison’s last breath) at Henry Ford’s Greenfield Village museum, just a wee bit outside NJ. 
The Stoogeum is a Three Stooges museum. Its near me but I’ve never been there.
In Schiedam, in the Netherlands, there’s a Museum of Gin, or at least, the Dutch “jenever”
It even has an escape room…!
I love this!
That was actually pretty cool…one of the more memorable “exhibits” there. I liked the Wright brothers’ Dayton house, too.
There’s a surfing museum – a much bigger one – in Huntington Beach (i.e. Surf City).
One of the coolest museums in the Bay Area *used to be 
* the Military Vehicle Technology Foundation, which featured something like 200 tanks, jeeps, gun platforms, rocket launchers and the like. Sadly the collection was sold off and the vehicles ended up with various different museums and owners.
I’ll see your Pianola Museum and raise you the Museum Speelklok or automatic-musical-instruments museum in nearby Utrecht.
The Antique Vibrator Museum, antiquevibratormuseum.com in Good Vibrations in San Francisco.
The Speelklok is one of my favourite places. They do guided tours demonstrating different automata, and ending up at a dance floor surrounded by HUGE dance-hall organs playing boogie-woogie.
http://autolycus-london.blogspot.com/2013/01/over-years-street-organs-seemed-to-have.html
In the same spirit; not an actual museum on actual premises – but something I recently came upon by chance:
Indeed: long live hobbies, no matter how abstruse, and the people who engage in them.
Re Spam Museum in Minnesota - We had a great time there (of course, we like obscure stuff and have been known to recite the Monty Python spam skit at inappropriate moments). History of can types (remember the key version?), video of old spam ads, huge variety of spam to try (teriyaki spam was ghastly). Best part was the gift shop where you could get both generic and Monty Python spam t-shirts, towels, cups, plates and various other “useful” things. I keep my pencils in a children’s sized mug that says “My First Spam Cup” and am often amused wondering at what age one gets a second or third one…
Intercourse, PA used to have a Knife and Edged Weapons Museum. Now they have the American Military Edged Weaponry Museum, which I assume is the same place. An odd addition to Amish country.
Prague, when I visited 7 or 8 years ago, had a Comics Art Museum, featuring one artist’s work. I never heard of him, but apparently he was paralyzed or rendered comatose by swallowing a fish bone and the museum’s gate money contributes to his hospital bills.
The museum itself isn’t unusual in its subject, but many people visiting El Greco’s house in Toledo are surprised by just how many not-so-different “Holy Family” and “Holy Family with Saint Anne” does it have. Apparently “self-portrait with my wife, son (and mother-in-law)” was a subject which sold very well so long as you marketed it right 
I just got back from a two week vacation in Greece. In Kalambaka, near Meteora, I visited the Natural History and Mushroom Museum (emphasis on the mushroom part).
The National Atomic Testing Museum in Las Vegas? Really cool exhibits including a 1950’s (inert obviously) atomic bomb.