Located in one of the flattest places on the face of this planet are the unexplained Sailing Stones of Racetrack Playa, Death Valley, California. The rocks move leaving clearly visible tracks behind them.
Photographer Nick Brandt took photos of the birds that die in the deadly Lake Natron in northern Tanzania. The alkalinity levels are so high in the lake it causes the animals to turn into statues, preserving them forever.
Photos: Iconic Shots of the Grateful Dead, Janis Joplin, Jimi Hendrix and More