Mother Nature is full of surprises. From a landscape of bubbling, gurgling mud volcanoes to swirling, blue walls hidden in a cave, the world is dotted with spectacular, natural oddities that may seem too strange to be real. But they are, indeed, real. Many of the world's most amazing sights can be found in the vastness of China.One of its natural treasures is the in Hunan Province. With its deep canyons, majestic waterfalls, and sandstone-quartz pillars towering over 650 feet...

Aletsch Glacier, Switzerland A hiker standing on the Aletsch glacier photographs an ice landscape on August 23, 2016 near Bettmeralp, Switzerland. (Sean Gallup/Getty Images) The glaciers of the European Alps are some of the region's most treasured natural wonders—and are prime tourist destinations. But the glaciers, such as Switzerland's Rhone and Aletsch glaciers, and Austria's Pasterze glacier, are rapidly shrinking, propelling them into the global climate change stage. The Pasterze Glacier, Austria's largest, , according to the Austrian Alpine Association's...

Coral bleaching in Okinawa, Japan, captured by the XL Catlin Seaview Survey in September 2016. (XL Catlin Seaview Survey) The underwater world that snorkelers and are known for the vibrant, rainbow colors of coral. But coral bleaching, a whitening of the coral due to a loss of the algae living within the tissue, is transforming some of the world's most important natural wonders and threatening some of the most colorful, richest marine habitats on Earth. Coral bleaching is caused by...