Up and down the Dead Sea, on the Jordanian and Israeli coasts, the shoreline is pockmarked by ... Driving a few miles south, past the ancient Jewish fortress of Masada, we come upon Ein Bokek ...

A hypothetical picture of Mars 3.6 billion years ago, when an ocean may have covered nearly half the planet. The blue areas show the depth of the ocean filled to the shoreline level of the ancient, ...