Remember that Photosynth tech preview that drew quite a bit of attention? Well, now the BBC has released a collection of Photosynth virtual tours to go along with their ‘How We Built Britain’ TV show. The portal to a variety of Photosynth virtual tours is available here. The screen shot above is me checking out the 11th century Ely Cathedral. There are a total of 6 virtual tours to take. This is cool stuff.