An 1847 play, "The String of Pearls, or The Fiend of Fleet Street," inspired which Broadway hit?

An 1837 fire destroyed the Winter Palace in which city, though the Hermitage's treasures were saved? Which 1845 Richard Wagner opera centers on a song contest at the Wartburg? Hector Berlioz's 1846 work "The Damnation of ___," based on Goethe, is about which man? An 1846 treaty set Washington's northern boundary at the 49th parallel, but Britain kept which island? An 1852 survey in British India found that "Peak XV" was the tallest mountain in the world; what is it now called? An 1853 fire at his publisher's warehouse burned the remaining stock of whose books, including "Moby-Dick"? Which British cavalry force of about 660 men was decimated in an 1854 charge at Balaclava? An 1854 cholera outbreak in London ended after Dr. John Snow had the handle removed from what?