Four European armies met at Constantinople in 1097 to launch the first of which campaigns?

Constance Bennett and Cary Grant played a ghostly couple who appear and disappear in which 1937 comedy classic? King George II, son of Constantine I, fled which country during World War II and returned to rule in 1946? Constantine XI, the last ruler of which empire, died fighting the Turks in 1453? Constantinople officially became which city in 1930? Which Asian island nation fought a long civil war between its Tamil and Sinhalese communities that ended in 2009? Construction and maintenance costs of which New York waterway were paid for by tolls until 1882? Construction began in 1248 on which German city's Gothic cathedral near the Rhine, taking 632 years to finish? Construction of the Empire State Building began in 1930 on the former site of which hotel, which moved to Park Avenue?