What is a dark underground prison cell in a castle called?

Which dance of the 1980s is also the title of Michael Jackson's 1988 autobiography? Which event took place in Boston on December 16, 1773? Which dark blue edible fruit shares its name with a Hanna-Barbera cartoon hound? Which dark rye bread originated in Germany's Westphalia region? Which word names both a 1995 David Caruso film and a valuable stone used in Chinese carvings for thousands of years? Which word names both a dawn event and a city in Broward County, Florida? What is a daytime performance of a movie or play called? Which Washington, D.C., medical center, founded in 1909, is named for an army surgeon?