Either Oasis Springs or Windenburg could have a dig site that gives tours to visitors (zoned museum, perhaps with a little cafe).
The suggested pool in Oasis Springs could be ancient bath (roman, arab, whatever culture you use) themed.
You already made Strangerville all military (cool idea), otherwise I'd suggested a botanical garden.
For the travel regions maybe train or bus stations? I have a cafe in Mt. Komorebi right across the slopes that is built like a train from the inside so that I can let my sims travel there. However, from the outside it looks like an equipment renting shack.