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Photo: J Dykstra, Public domain via Wikimedia Commons
Devoted to the local cult activity; you can decide for yourself whether it's serious or not.
The International UFO Museum and Research Center is located in Roswell, New Mexico, United States, in the downtown district, and is focused largely on the 1947 Roswell incident and later supposed UFO incidents in the United States and elsewhere. It was founded in 1991 as a 501c3 nonprofit educational organization and is located in a former movie theater from the 1930s. The museum contains an extensive library and exhibits all focused on the history of UFO encounters. Additionally it has an extensive library collection of UFO material and meeting room. It functions as the centerpiece of the annual UFOfest held in Roswell each year.
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This one is definitely serious, incorporating a surprisingly good art collection for a small town, with works by Georgia O'Keeffe and Peter Hurd, among others. There is a wing devoted to space flight and rocket science (but not UFOs!) that includes the Robert H. Goddard Planetarium, named in honor of the rocketry pioneer who did much of his research in Roswell.
A state park with swimming, fishing, and hiking. The lakes are very deep with nearly vertical cliffs surrounding them.