If you've done sightseeing in most major EU countries, go back to your favorites or dive deeper into something of interest. Maybe do/see something related to a

If you've done sightseeing in most major EU countries, go back to your favorites or dive deeper into something of interest. Maybe do/see something related to a hobby? For example I've gotten into woodworking recently but on a previous vaca to England years ago it wasn't a hobby. If I were to go back, I might look at things in museums or just old structures/furniture/architecture differently and get a different level of enjoyment out of it.