I think one other sensory experience that might compliment the virtual field trip could be food. You could bring the kids snacks with foods from the areas of the world that you are visiting. Another sensory experience could be music. You could play music that is local to a certain culture you are exploring. You could also teach a dance from the native culture of the area you are learning about. You could skype with someone from that area of the world as well. You could also look up fun crafts to do that could recreate something from that culture. For example, if you were studying the Egyptians you could build a pyramid out of sugar cubes.