A giant Ferris wheel graces which city's Prater park, opened to the public by Emperor Joseph II in 1766?

What were German submarines in the two World Wars commonly called? A German woman may pluck her "Augenbrauen". What are they? A gerontocracy is a government ruled by whom? A G.I. Joe figure introduced in 2000 represents one of which Native American World War II code talkers? Which giant hunk of Hollywood was born Roy Scherer Jr.? A giant sea monster turns out to be a submarine in which 1870 Jules Verne tale? A gift from France unveiled in 1886 stands in the harbor of which city? Prunus serrulata is one of the main species of which trees, given by Japan in 1912 and planted around Washington's Tida…