Yep, we did a tour of Classical Spain - all the Moorish palaces in Andalucia a couple of years ago - it's advertised in all the broadsheets. What we saw was fabulous but there was an element of being herded about although we did have lots of free time to balance it out. We opted for it because otherwise we might not have seen half the places on the list under our own steam. You have to weigh the pros and cons, I guess.