Did you know that some sand dunes can sing? This Atlas Obscura article talks about the tallest stationary dunes on Earth in the Badain Jaran Desert. Not only are they the tallest, but they can also sing.
On a small scale, such as a beach, this phenomenon creates a high-pitched sound, but on a much larger scale, it can emit a low-pitched rumble or booming sound, and at up to 105 decibels, it can be quite loud.
We’re curious, what is the most obscure thing you’ve discovered while exploring?