Imagine owning an island fortress with it's own Wikipedia and Grade II* listings!
https://en.wikipedia.org/wiki/Thorne_Island
https://britishlistedbuildings.co.uk/300017169-thorne-island...
Try not to imagine the upkeep costs on the historic-listed 2 acres that you paid $4M for - which are only accessible by helicopter, or by risk-tolerant boat (Wikipedia notes a dozen wrecks in the immediate vicinity) and lots of stairs.