Suggest a US based travel destination that feels Like a Time Capsule

I am planning a road trip for me, my husband and teenage kids and I want to find some destinations that feel not of this era. As it’s a road trip if there is a whole region, I would be interested in that too.

A couple examples of vacations that felt like this:

Mackinac Island Michigan - no cars on the island, horse drawn carriages, visited a military fort, Felt like 1800s.

Upper Peninsula of Michigan road-trip felt like nothing more recent than the 1970s. No chain restaurants, no chain hotels, we ate at small bars and diners. Everything we saw and did felt like a family could have done the same trip in the 1950s.

Missouri road trip - I don’t remember the exact cities but we stayed in but they were small towns, and everything felt slower. Went to visit state and national parks.Went to a small town with an ice cream shop. The town had a “town dog “ that walked himself to a restaurant in town everyday for treats so we just followed the town dog around for a while.

I don’t want it to feel later than the 90s.

Thank you