In one city block in St. Augustine's Old Town, there is a cluster of historic houses. If memory serves, the structures comprising the Dow Museum of Historic Houses date from the late 18th to the early 20th Century, thus serving as a snapshot of American residential architecture during the whole time the USA has been the USA.
Walls now encircle these nine houses, and inside the walls they share areas of gardens and paths designed in various architectural styles. Each house has its own history -- but if you are not interested in American design and architecture, you may need to find other forms of entertainment. Just look on TripAdvisor or Yelp to read about how "BOOOOORING!!!!" these houses are and how "There's NOOOOOTHING to SEEEEE here!!!" Philistines. Go visit the Gator Farm and ride their zip-lines if you want more action.
As with every other form of entertainment, how much you enjoy looking at historic houses and masonry details in garden walls depends on whether or not you are interested in such things. As for me? Yes, please. That house up on the left there, has a foundational issue with a small sinkhole, which I find highly amusing. Because I do not own that house. And because in years past I have come dangerously close on more than one occasion to buying a house in exactly that condition.
In other Dow Museum houses (all of them in better condition than that red carpenter's house up there), the varieties of stained glass windows alone, kept me excited for hours. And by spending my time looking at old houses, I shorten the line for the zip-line customers. Win-win for all us tourists.