Vigilant Ship at Britton Hill
Britton Hill (in what used to be Florida) is unique for two reasons: first, it is the only part of Florida that was not inundated by the mega-tsunami during the Serpentfall. Secondly, it is the final resting site of what appears to be a Royal Navy submarine (the HMS Oberon). Assuming anyone checks, the Oberon is thoroughly incapable of sailing again; there are gaping holes in the hull and the keel has been thoroughly shattered.
There were no obvious survivors, and the entire area was thoroughly scoured of human life by the implacable waves. To this day nothing human lives within twenty miles of the place — and, for that matter, very little that is monstrous does, either. Britton Hill has a Serpent Taint of 2 generally, and 0 inside the Oberon itself. The aura of calm that surrounds the broken submarine is pretty much palpable.