View of Lake Atitlan, with Toliman and Atitlan volcanoes in the background, Toliman and San Pedro, Guatemala. (Photo by DeAgostini/Getty Images)





The Wasserfallboden water reservoir of Austrian hydropower producer Verbund is seen near Kaprun, Austria, August 31, 2016. (Photo by Leonhard Foeger/Reuters)





Castell Dinas Bran, Denbighshire, UK, 2016. The ruins of the 13th-century tower over Llangollen and the Dee valley, where there has been a fort since the iron age. The ruins are thought to have been built in the 1260s by Gruffydd Maelor II, one of the Princes of Powys. The Panorama Walk, a minor road above Llangollen below the limestone crags of Eglwyseg, is a perfect place to view the castle from. (Photo by Stuart Holmes)





Fall foliage colors a line of mountains in Chatham, N. H., as unsettled weather begins to clear, October 4, 2016. The state's mountain regions are approaching their peak autumn colors. (Photo by Robert F. Bukaty/AP Photo)





The Christ the Redeemer statue stands above Rio de Janeiro, Brazil at sunset on Tuesday, May 6, 2014. The 2016 Olympic Games will be held in Rio de Janeiro. (Photo by Hassan Ammar/AP Photo)





In this photo provided by the National Park Service, Upper Yosemite Falls flows at full force after two days of significant rainfall Wednesday, December 3, 2014, in Yosemite National Park, Calif. A second day of much-needed rain fell across drought-stricken California on Wednesday, but the storm had so far produced few of the problems such as flooding and mudslides that had threatened areas left barren by wildfires. (Photo by AP Photo/National Park Service)





The sun sets over the Geneva Lake and the Swiss and French Alps mountains above Montreux, Southwestern Switzerland, Wednesday, February 11, 2015. (Photo by Laurent Gillieron/EPA)





This August 19, 2011 file photo shows Mount McKinley in Denali National Park, Alaska. (Photo by Becky Bohrer/AP Photo)





Undated handout issued by Take A View of Sunrise at Winnats Pass, Derbyshire, England which won the Visit Britian “You're invited” Award for the best image from an overseas entrant category in this year's Landscape Photographer of the Year Awards. (Photo by Sven Mueller/PA Wire)





Fall colors are seen at New Hampshire's Cathedrel Ledge Monday, October 24, 2016, in Conway, N.H. (Photo by Jim Cole/AP Photo)





Quiraing circuit is the famous trakking trail of Isle of Skye, United Kingdom. It is located in the north east of island. (Photo by Getty Images)





Sunrise over Teide National Park with a cloud on top of Teide volcano, Teide National Park, Tenerife, Spain on September 30, 2016. (Photo by Santiago Urquijo/Getty Images)





A photo shows snow observed on top of Mt. Fuji on Sunday afternoon for the first time this autumn from a Yomiuri Shimbun helicopter on October 11, 2015. According to the Kofu Meteorological Office, this year’s first snow on the 3,776-meter highest mountain is five days earlier than last year and 11 days later than in the average year. (Photo by The Yomiuri Shimbun via AP Images)





This photograph taken on May 17, 2009, shows a general view of Everest Base Camp in Nepal. Scores of Nepalese guides and foreign climbers on Mount Everest packed up April 24, 2014, loading supplies onto yaks and booking helicopters, with the climbing season increasingly in doubt after an avalanche killed 16 people last week. Expeditions prepared to leave shortly after crisis talks ended with the Nepal government at Everest base camp in the wake of the worst ever accident on April 18, on the world's highest peak. (Photo by Pemba Dorje Sherpa/AFP Photo)