One of the conditions to make the brocha on kings is that they have the power to kill you (see Radvaz 1:296 as well as the Orchot Chaim Brachos 49 that say that this brocha is recited on any monarch ...
Do you make a bracha when seeing Niagara falls, and, if a bracha is made, which bracha?
During the Pesach seder, but not during the rest of Pesach, we say b'rachot for the mitzvot of matzah and maror. (I mean the "asher kidshanu b'mitzvotav" b'rachot.) So it seems that we are only ...