Capertee Valley, 135 kilometers northwest of Sydney, is said to be slightly longer than the Grand Canyon but not quite as deep, making it the world's second-largest enclosed canyon.
It's got small hills rather than a whopping great rock, but this desert region 50 kilometers southwest of Oodnadatta is spectacular.
It's best seen at sunset when rocky outcrops glow red, pink and orange.
Not all of Queensland's natural wonders are located on the coast. The world's longest molten-rock tunnels, 275 kilometers southwest of Cairns, were formed 190,000 years ago and include impressive underground caves.
"Kakadu's little brother" is one of the best places in the Top End for bushwalking and swimming in croc-free pools. A two-hour drive from Darwin, Litchfield is also more accessible than Kakadu during the wet season.