Heard Island, Australia
Heard Island is the tallest mountain in Australia, and has its own active volcano known as Big Ben. It’s one of the country’s best kept secret. But even if you could make it up there, you wouldn’t be able to see the Big Ben due to the dense clouds. You’d most likely only only hear the molten rock bubbling up. It’s why no one is living on the island and only the Australian government has main access to it. However, they do on occasion allow research expeditions to enter the island.