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Humpback whales cooperatively feeding in Chatham Strait in southeast Alaska photo by @susanseubert #onassignment for #natgeoexpeditions by natgeotravel

“Photo by @michaelclarkphoto // Joe Nodeland sea kayaking in, around and through the tiny Wedge Islands not far from the Johnstone Straight in the Queen…”

Photo by @james_balog. Columbia Glacier descends from an ice field 3050 meters above sea level down the flanks of the Chugach Mountains and into a narrow inlet that leads into Prince William Sound in southeastern Alaska. It is one of the most rapidly changing glaciers in the world. Since the 1980s the glacier's terminus has retreated some 12 miles and thinned substantially losing about half of its thickness and volume. Follow @james_balog for more images of disappearing glaciers…

natgeo Photo by @argonautphoto (Aaron Huey). Crossing the upper #RuthGlacier in #DenaliNationalPark, Alaska, on skis and roped together to protect us from a potential fall into an unseen crevasse. Truly one of the most beautiful places I have photographed in my life. My story on Denali comes out next week in @natgeo magazine, so excited to share this work with you guys! You can see more of my images from Denali at @argonautphoto.

Enter the #VisitCaliforniaContest for a chance to win a seven-day National Geographic family trip to Yosemite National Park sponsored by @visitcalifornia! Post your best shots of the Golden State to Instagram with #VisitCaliforniaContest and include a caption with the location and a short description. The contest runs from May 1 to May 31. For more information and contest rules visit http://ift.tt/1Tmu0yd. by natgeotravel

Turret Arch is one of the beautiful arches you will see along the Windows section of Arches National Park. And If your timing is right you just may be able to catch someone standing below the arch. This National Park is one of my favorite ones at which to photograph. // photo by @jonathan_irish by natgeotravel

A male shortfin pilot whale carries a dead calf, whose skin is beginning to slough off, is likely the offspring of this social group. Throughout history there have been occasional reports of cetaceans caring for their dead

Walking through Mammoth Cave which now has well-built paths and good lighting it is hard not to think back to the cavers who started exploring here hundreds (if not thousands) of years ago. There is no place darker than the depths of a cave...turn the lights out and it is the blackest black. These early explorers were lowered into the unknown with ropes tied around their waist. They had only reed torches to light their way and they had to hope and pray they had enough light to find their…

Photo by @argonautphoto (Aaron Huey). @hawkeyehuey takes a break from his assignment for @natgeotravel to swim at (and slide through!) the shark tank at the Golden Nugget Casino in Las Vegas. To see more of Aaron and Hawkeye's family road trip assignment follow along at @hawkeyehuey and @argonautphoto! by natgeotravel