Actually, you can plan for this type of shot but it takes an incredibly huge amount of patience. Something like the Eifel Tower is a lightning rod that is pretty much guaranteed to get struck by lightning during any lightning storm. All photographer has to do is set up the camera on a tripod at the start of a storm, then keep taking one long exposure shot after the other until the storm is over. Using two cameras starting new exposures at staggered times would eliminate the chance of missing a strike in the split second between the end of one shot and the beginning of another. If a good shot isn't achieved during that storm, wait for the next. Like I said, an incredibly huge amount of patience.