Probably the UK, mainly due to the history. You’ve got archaeology going back to the bronze age and before, well-preserved ruins from throughout the medieval era, and a very well-documented pre-modern history record.
They had a fairly unique path through global history, from the darkness of the colonial and imperial era, to being the bastion against Napoleon and then European fascism, to the seat of the voluntary and cooperative Commonwealth nations today. They’re one of the best examples of just how much a society can evolve, and are still one of a handful of European nations where the far right is struggling the most to gain a foothold. I admire that greatly.
Oh, and I never did quite grow out of my longbows-are-cool phase. And ships. Ships are cool too. And British humour is entertaining. And they like to insert a random letter U here and there for no discernable reason.