Picture taken with a drone shows festival visitors enjoying fishing on a frozen river during the annual Pyeongchang Trout Festival, Pyeongchang county, South Korea, 24 January 2019. (Photo by Jeon Heon-Kyun/EPA/EFE)





A drone photo shows an aerial view of 2,000-year old ancient Roman Bath Basilica Therma at Sarikaya district of the central Yozgat province in Turkey on January 08, 2019. With it's 48-49 centigrade degrees water temperature the bath provides an opportunity for swimming during winter season. Basilica Therma, also known as the King's Daughter which is one of the historical figure of the Roman Empire, attracts many tourists' attention. (Photo by Sercan Kucuksahin/Anadolu Agency/Getty Images)





Anak Krakatau volcano and the closeup of the crater, following the large eruption on December 22, 2018, are seen in Indonesia, in this DigitalGlobe satellite image from January 11, 2019. (Photo by Satellite image ©2019 DigitalGlobe, a Maxar company/Handout via Reuters)





A balloon flies during the 41st International Hot Air Balloon Week in Chateau-d'Oex, Switzerland on January 26, 2019. (Photo by Denis Balibouse/Reuters)





This aerial view shows a man swimming in a pool cut in a frozen lake in Shenyang, in China's northeast Liaoning province on January 11, 2019. (Photo by AFP Photo/Stringer)





Aerial view over mud and waste from the disaster caused by dam spill in Brumadinho, Minas Gerais, Brazil, 26 January 2019. At least nine people have died and 300 are missing after a tailings dam burst at the Feijao mine in southeastern Brazil owned by Vale, the world's largest iron-ore producer, the Minas Gerais state government said. The dam in Brumadinho near Belo Horizonte broke on 25 January at around mid-day, unleashing a river of sludge that destroyed some nearby houses. (Photo by Antonio Lacerda/EPA/EFE)





This aerial view shows the tops of highrise buildings poking out from heavy fog in Yangzhou, in China's eastern Jiangsu province on January 14, 2019. Authorities in the city issued a fog alert with heavy fog reducing visibility to 50 meters (164 ft.). (Photo by AFP Photo/Stringer)





Berthed boats are seen on the river Bodrog partially covered by forming ice in Tokaj, Hungary, Friday, January 25, 2019. (Photo by Zsolt Czegledi/MTI via AP Photo)





This aerial photo taken on June 25, 2018 shows a person walking with an umbrella along a path through lotus flowers in Yangzhou in China's eastern Jiangsu province. (Photo by AFP Photo/Stringer)





An aerial view of boats at Lake Marmara, after the water level dropped, located between Salihli and Golmarmara districts of Manisa, Turkey on October 30, 2018. Water rate at Lake Marmara dropped to 10 percent. Lake Marmara was listed a wetland with national importance as it hosted 20,000 birds including dalmatian pelican and pygmy cormorant species in 2017. Lake Marmara used to annually provide approximately 150 million cubic meters precipitation over Gediz Plain. It is reported that after the summer's heat water level at the lake dropped to a critical rate, with depth in some areas dropping to 50 centimeters, which is considered to be around 33 million cubic meters. (Photo by Kamil Altiparmak/Anadolu Agency/Getty Images)





Aerial view of bullet trains waiting at a railway station during the first day of 2019 Chinese Spring Festival travel rush on January 21, 2019 in Nanjing, Jiangsu Province of China. The 40-day Chinese Spring Festival travel rush starts on Monday, lasting until March 1. The Spring Festival, or Chinese Lunar New Year, falls on February 5 this year. (Photo by VCG/VCG via Getty Images)





Mount Wilson, New South Wales, Australia on September 10, 2018. These breath-taking pictures captured from a drone reveal the secret patterns of landscapes that can only be seen from the sky. (Photo by Demas Rusli/South West News Service)





An aerial view shows combines harvesting wheat in a field of the Solgonskoye private farm outside the Siberian village of Talniki in Krasnoyarsk region, Russia September 7, 2018. (Photo by Ilya Naymushin/Reuters)





Officials check a ground where mats are laid for celebrating International Day of Yoga, in Dehradun, India, Wednesday, June 20, 2018. International Day of Yoga will be celebrated on Thursday. (Photo by Manish Swarup/AP Photo)





Aerial photo shows vessels partcipainting in the traditional “skutsjesilen” competition of on a lake in Lemmer, Friesland, the Netherlands, 15 August 2018. For two weeks, 14 traditional Frisian flat-bottomed boats compete against each other on the lakes of Friesland. (Photo by Siese Veenstra/EPA/EFE/Rex Features/Shutterstock)





Stranded boats are pictured on the dried out shore of the Brenet Lake (French: Lac des Brenets) part of the Doubs river, a natural border between eastern France and western Switzerland, 26 October 2018. For several months, precipitation has been extremely low on Swiss territory. (Photo by Anthony Anex/EPA/EFE/Rex Features/Shutterstock)





A massive fast moving lava flow consumes everything in its path, as the flames from the remnants of one home burns on the left, while it approaches another on the right. Pahoa, Hawaii, USA, 19 May 2018. The ongoing eruption of Kilauea is the largest in decades, destroying more than 40 homes to date, and displacing thousands. (Photo by Bruce Omori/EPA/EFE/Paradise Helicopters/Rex Features/Shutterstock)





In this Friday, December 4, 2018 photo, a half sunken ferry lays on its side in the Gulf of Elefsina, west of Athens. Dozens of abandoned cargo and passenger ships lie semi-submerged or completely sunken around the Gulf of Elefsina, near Greece’s major port of Piraeus. Now authorities are beginning to remove the dilapidated ships. Some of them have been there for decades, leaking hazards like oil into the environment and creating a danger to modern shipping. One expert calls the abandoned ships “an environmental bomb”. (Photo by Thanassis Stavrakis/AP Photo)





A photo taken with a drone shows a tractor equipped with the prototype of a plant protection robot working on a salad field during the robot's presentation in Galmitz, Switzerland, 01 June 2018. A plant protection robot is currently being developed as part of a pilot project that compared to the conventional method (spray bar) will use 40-70 percent less pesticides. (Photo by Anthony Anex/EPA/EFE/Rex Features/Shutterstock)





A drone photo shows a sea port with boats through the Ucagiz port, known as Teimiusa, that belongs to Myra Ancient City in Antalya, Mediterranean coast of Turkey on July 25, 2018. Antalya is one of the most outstanding tourist attraction cities all over the world in terms of cultural, sea, sports, health, winter, congress, plateau, cave, camp and belief tourism. The Myra City has been in existence since 5th century B.C. with Lycian period rock tombs, Roman period theater. (Photo by Mustafa Ciftci/Anadolu Agency/Getty Images)