An awesome virtual tour you might want to check out is the one offered by the Museo Galileo. Located in the city of Florence, the museum houses some of the most important instruments in scientific history. Virtual tours of the museum might actually be the best way to see the museum as it can be a bit tricky to actually physically visit the place. It is a pretty small building and tends to be very popular over the summer months.
An awesome virtual tour of a science and tech museum comes as the courtesy of The Museum of Natural Sciences in Belgium. Containing tons of Dinosaurs and other interesting scientific exhibits, this virtual tour is definitely worth a gander.Like the NHM in London, this tour was partially developed with the help of Google's Cultural Institute.