So my novel setting is a pseudo-European continent that is at a Renaissance level of technology, and over the past century has experienced rampant sea level rise. I’d imagine that this would present a massive challenge in terms of people having to move, large cities and centers of trade and art drowning, and political unrest as a result of the environmental shift. But as I thought more about it, I realized that it’s likely that many kingdoms and other power brokers would be willing to invest time, money, and manpower into things such as dams, some sort of large drainage system, and efforts into saving things like structures of historical importance and holy places.
This brings me to the idea of an Atlantis style dome, which would be in maybe 50 ft of water, and would reach a height of 50 feet above the waves. I haven’t fleshed it out fully yet, but I’m imagining that in it, there’s a cathedral or monument important enough to the people/culture of the area to merit saving.
Would such a structure be possible, given the technology of the time? If not, what are some plausible ways to get close to this idea, or to save the important site in another way?