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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.
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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.