When you think about the US, you definitely don't picture the Roman Empire 18th-century Spanish missions. But you should. In San Antonio, Texas, the Spanish built several of them in the early 1700s. Over 300 years later, the buildings have deteriorated a bit, but they've held up pretty well overall.

Not the 12th century like the monastery in Florida, obviously (and I'm not joking), but by local standards, that's ancient history.

PS. I stumbled upon this cute little restaurant in the middle of nowhere. Really charming atmosphere. And the food's solid. I didn't see anything more tex-mex during this trip. If you're ever in the area, it's definitely worth checking out.