A handout phptopgraph made avaiable by NASA showing Russian support personnel roll the Soyuz TMA-19M spacecraft after it landed with with with Expedition 47 crew members Tim Kopra of NASA, Tim Peake of the European Space Agency, and Yuri Malenchenko of Roscosmos near the town of Zhezkazgan, Kazakhstan 18 June 2016. Kopra, Peake, and Malenchenko are returning after six months in space where they served as members of the Expedition 46 and 47 crews onboard the International Space Station. (Photo by Bill Ingalls/EPA/NASA)

A hot air balloon rises in the sky during the International Hot-Air Balloon festival in Pokhara on December 27, 2024. With Nepal's snowy Himalayan peaks as a backdrop, the sky above Pokhara transformed into a vibrant canvas of colours for the country's first hot-air balloon festival. (Photo by Prakash Mathema/AFP Photo)

A visitor takes in a view of the downtown district from Twin Peaks on Friday, January 9, 2015, in San Francisco. (Photo by Marcio Jose Sanchez/AP Photo)

A volunteer holds the peak of a flamingo chick after it was fitted with an identity ring at a lagoon in the Fuente de Piedra natural reserve near Malaga, southern Spain, July 30, 2022. (Photo by Jon Nazca/Reuters)

This aerial image shows autumn leaves at their peak as they surround Tsutenkyo Bridge amongst the grounds of Tofukuji Temple, in the city of Kyoto on November 27, 2024. (Photo by JIJI Press/AFP Photo)

Japan Self-Defense Force (JSDF) soldiers and firefighters make rescue works among mountain lodges, covered with volcanic ash near the peak of Mt. Ontake, which straddles Nagano and Gifu prefectures in this September 28, 2014 photo taken and released by Kyodo. More than 30 people were feared dead on Sunday near the peak of the Japanese volcano that erupted a day earlier, sending a huge cloud of ash and rock tumbling down its slopes, while packed with hikers. (Photo by Reuters/Kyodo News)

Buzludzha is a historical peak in the Central Stara Planina, Bulgaria and is 1441 metres high. In 1868 it was the place of the final battle between Bulgarian rebels led by Hadji Dimitar and Stefan Karadzha and the Ottoman Empire. The Buzludzha Monument on the peak was built by the Bulgarian communist regime to commemorate the events in 1891 when the socialists led by Dimitar Blagoev assembled secretly in the area to form an organised socialist movement with the founding of the Bulgarian Social Democratic Party, a fore-runner of the Bulgarian Communist Party. The Monument was opened in 1981. No longer maintained by the Bulgarian government, it has fallen into disuse. Buzludzha is reached by a 12 km side road from the Shipka Pass.

Lily Nguyen of Jessop, from Maryland, leaps up in the air as a friend takes her photo in front of cherry blossoms which have reached their peak bloom, along the Tidal Basin, in Washington, D.C., U.S., March 21, 2022. (Photo by Kevin Lamarque/Reuters)