I helped out my friend Silv with her project to create a light bridge from London to Rio. This involved taking a simultaneous photo in Rio and in London at the correct bearing so the two lenses are facing each other though of course out of direct view. The photo for London was in fact taken on the coast at Selesy in Sussex which lies on the bearing from London to Rio
Once you know the latitude and longtitude of the two locations the bearing can easily be found using the this website