Sting or swim
On the Rock Islands of Palau, swimmers dive into a centuries-old lake filled with jellyfish. Luckily, the jellyfish have lost their stingers over the years because, within the friendly confines of the lake, they no longer need to fight off predators. Swimmers from around the world dive in to swim with, touch, and take selfies with what look like typically dangerous jellies.
© Bernard Radvaner/Corbis