While sightseeing in Europe, is it useful to bring my passport along, or should I leave it in the hotel room? Does a US passport bring any discount at various attraction sites (museum, ruin, etc)? Do I need it for driving, in addition to the US and international licenses I carry?
My thinking is there is a greater chance of losing the passport if I bring it along, than to leave it in the hotel room and place it inside the suitcase. The hotel I have in mind is a 2-3 star hotel.