Suppose a teacher is doing a lesson on a sculpture that is in the Lourve Museum in France. That teacher has the opportunity to take the class there (virtually) and view that sculpture as if they are physically there. Virtual tours also provide teachers and schools that cannot afford many field trips the opportunity to experience museums as if they were actually there. It is a close alternative to the real thing. That being said, I believe nothing can replace the actual experience of visiting a museum.
In conclusion, money, time and location can often limit the field trips that schools can offer. Ultimately, I don’t think virtual tours can replace the physical experience of going to a museum however, they offer so many positive opportunities that make them extremely beneficial.