Finding a unique place to stay can really make a holiday, especially if you're planning a bit of relaxation time at your accommodation. I've managed to stay in a few odd places, including underground hotels and old animal stalls, but I'm still waiting to spend a night in an ice hotel. And now I'm adding "lighthouse" to my list!
In Croatia, there are (to date) eleven lighthouses that accept holidaymakers. A lot of them want you to book by the week (or at least 3 days), so if you're traveling extensively and fast, it may not suit: but if you can schedule in a few lighthouse days, I think you're getting something really special.
Four of the most easily accessible lighthouse-hotels are Savudrija, Rt Zub and Sv. Petar (all on the mainland) and Veli Rat (on an island, but reachable by ferry and near a village). Seven others are a little more remote, but that's half the fun.