2. The Monolith of Uluru. A place considered sacred by a local aboriginal tribe, the Uluru is a mysterious landmark in the southern part of Northern Territory in central Australia. The Uluru is considered an inselberg, or island mountain, in that it’s a giant mass of sandstone climbing over 348 meters into the sky but is somehow surrounded by flat lowlands in every direction. Those flying over the monolith are treated to a view of a colossal rock that appears to be sinking into the earth. Given the terrain, it’s very odd that such a mountainous formation formed, and no one knows how it got there or who put it there.