This is one I really enjoyed. Check out this panoramic photography website which gives you a 3-D virtual look inside some of the 'sacred' locations associated with The Da Vinci Code. You can stand at the doorway of the church at Rennes-le-Chateau or survey the view from the Tour Magdala, look around Rosslyn Chapel from multiple vantage points and visit the interior of St Sulpice. If you enjoy some of those, browse through the whole collection from various places around the world at the main website. Thanks to David for the tip.