A blue observation point contrasts with the orange winter foliage of the metasequoia trees – dawn redwoods – at Huanghai Forest Park on the east coast of China in the second decade of December 2024. (Photo by Splash News and Pictures)

Dinosaur costumed actors representing Thailand's establishment at a high school student led protest in Bangkok, Thailand on November 21, 2020. (Photo by Matthew Tostevin/Reuters)

Revellers light firecrackers during Diwali, a Hindu festival of lights, in New Delhi on November 12, 2023. (Photo by Sajjad Hussain/AFP Photo)

Muslim women light candles during the “EarthHour” in Jakarta, Indonesia, on March 23, 2013. Hundreds of people observed the global event that encourages people to turn off their lights for 60 minutes. (Photo by Dita Alangkara/Associated Press)

The Aurora Borealis (Northern Lights) lights up the sky near the village of Pallas (Muonio region) of Lapland, Finland September 8, 2017. (Photo by Alexander Kuznetsov/Reuters/All About Lapland)

A Palestinian woman is assisted at the site of an Israeli strike on a house in Rafah in the southern Gaza Strip on October 30, 2023. (Photo by Reuters/Stringer)

Palestinians walk at the site of Israeli strikes on houses, in Jabalia refugee camp in the northern Gaza Strip on November 21, 2023. (Photo by Abed Sabah/Reuters)

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 No longer maintained by the Bulgarian government, it has fallen into disuse.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.