Among Iceland's most breathtaking landscapes is the coastal point at which its yellow river meets the blue sea, separated by a black sand beach.

Hawaii's Big Island sets the stage for numerous exciting natural wonders, from Volcanoes National Park to the rare black sand Punaluʻu ... would flow down to the ocean where it would cool and ...

It's like watching a natural disaster in slow motion, he said. “It’s a city surrounded by an ocean of sand that’s advancing every minute,” El Wely, the president of the local Association ...