What is the name of the famous prehistoric monument located in Wiltshire, England?

Which famous island is home to the active volcano Kilauea? What is the name of the famous waterfall on the border of Canada and the United States? Which mountain is the highest peak in North America? Which lake is the deepest in the world? Which island nation is home to the famous volcano Mount Yasur? What is the name of the famous cave system located in Kentucky, USA? What is the name of the famous delta located in Egypt? What is the name of the famous cave system located in Vietnam?