We've all grabbed a stick and drawn a figure in the sand on the beach, but Jim Denevan took this artform to the extreme: he created some of the largest human-made art on Earth!
Dark Roasted Blend has a neat feature on Jim's artwork (including one 3-mile across made on a dry lake in Nevada! It took 100 miles of walking to draw that pattern)
The Great Wall of China is bigger.
The beach drawings dont last very long as the tide washes them away quickly