One of my co-workers pointed this site out to me a few weeks back. There's a guy in Spain who has built remote control helicopters with cameras on them, who then takes videos of some pretty awesome things. He's posted some great videos, but one of my favourites is the Santiago de Compostela Cathedral. Alas, he didn't get any shots of the indoor, original medieval, west facade. But he does show the stone roof and a lot of details in and around the cathedral.
Here's a link to his site (in Spanish) explaining who he is. And his Vimeo site, with a lot more videos.
Santiago de Compostela Cathedral by albertocvr oktokopter from albertocvr on Vimeo.