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During the late-1920s Ho Chi Minh lived in Phichit secretly for several years, working to end French colonialism out of Indochina. In September 2018, Thailand and Vietnam opened the Ho Chi Minh Museum to commemorate his stay in Phichit. The museum contains artifacts, memories, and images of the Vietnamese leader during this period.
Not that big a deal, but there is small pond with crocs, which you can observe from behind a wire fence. Free admission.
This is the ancient city of Phichit, founded 6km from the new city. Not a huge amount to see, the site has only been partially excavated and little work has been done to turn ruins into a tourist attraction, but that seems to be the plan.
This is a small museum housed in several rooms of the provincial hall, found by the river. With information on local history, culture and geography it's worth a look.