What is the name of the famous cave system located in Vietnam?

What is the name of the famous prehistoric monument located in Wiltshire, England? 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? Which river flows through the famous Plitvice Lakes National Park in Croatia? Which river flows through the famous Manaus city in Brazil? Which island is home to the famous Mount Teide volcano? Tirana is the capital of which country?