Misc: In which city is the Canale Grande?

Questions

Australia's highest mountain is named for Thaddeus ----------------, the Polish general who fought in the American Revolution.?

----------- is the most densely populated non-island region in the world, with more than 1,970 humans per square mile.?

--------------, in the eastern West Indies, is one of the world's most densely populated countries.?

Barking Sands Beach on the Hawaiian island of ---------- is known for its unusual sand that squeaks or "barks like a dog." The dry sand grains emit an eerie sound when rubbed with bare feet.?

Before 1918, ----------- belonged to Austria-Hungary; from 1918 to 1991, it was part of Yugoslavia. It declared its independence on June 25, 1991.?