I just came across this virtual tour of the Majorca Cathedral in Spain. While the high quality link isn't as high-resolution as some Quicktime VR (QTVR) tours that I have seen, there are still some pretty stunning views (avoid the low quality link, it is just too small). The download is just over 2 megabytes, and it requires that you have Apple Quicktime (or other compatible QTVR viewer) installed on your computer.
Note: Shift will zoom-in, Ctrl will zoom-out. Moving the mouse around will look-around the Cathedral.