Bottled City

A city shrunk down, Kandor-style, to escape a great disaster (flood or earthquake, maybe). It was lost for some time, perhaps buried or sunk. When it's unearthed and reconstituted some distance away there are a few changes: for one, the people have become unused to light. They rebuilt in a valley between two mountains, in perpetual shadow. It gets less than an hour of sunlight each day of summer, and none at all in winter. For another thing, the people of the town were isolated for generations. Their language is antique, their customs somewhat bizarre to modern visitors.