organization Europa Nostra, specifically due to the planned construction of the gondola lift. Little Kalemegdan Park Mali Kalemegdanski park (Мали Калемегдански парк) occupies the area in the eastern section, which borders the urban section of Belgrade. The northern section of Little Kalemegdan Park is occupied by the Belgrade zoo, opened in 1936. The Cvijeta Zuzorić Art Pavilion is also located here. Overview Kalemegdan is the most popular park among Belgraders and for many tourists visiting Belgrade because of the park's numerous winding walking paths, shaded benches, picturesque fountains, statues, historical architecture and scenic river views (Sahat kula – the clock tower; closed in 2007 for the reconstruction, reopened in April 2014, Zindan kapija – Zindan gate, etc.). The former canal which was used for city supplying in the Middle Ages is completely covered by earth but the idea of recreating it resurfaced in the early 2000s. Belgrade Fortress is known for its kilometers-long tunnels, underground corridors and catacombs, which are still largely unexplored. In the true sense, fortress is today the green oasis in the Belgrade's urban area. As a combination of several habitats (parkland with old trees, fortress, landscape view of rivers and forested Veliko Ratno Ostrvo), Kalemegdan may be interesting for overseas tourists-birdwatchers as it provides a snapshot of local bird fauna. It is also important as the resting spot for small passerine birds on migration, before or after crossing the rivers Sava and Danube. Kalemegdan has its own eBird hotspot and associated webpage at Kalemegdan Hotspot The Belgrade Race Through History, an annual 6 km footrace, takes place in the park and fortress as a way of highlighting the history and culture of the area. The Belgrade Fortress was nominated by the Serbian government for the UNESCO's World Heritage Site. Architects and urbanists think that possible inclusion on the list will protect the fortress from "aggressive transitional construction". In that case, the outlines of the fortress and a panoramic view on it will have to be preserved. The perceived visual pollution encompasses several objects. A gigantic object, a late 2000s project by the Zaha Hadid's studio, on the northern side of the fortress, down the slope of Danube. The project, despite some preparatory works, still didn't start off. The other was the spiral project "Cloud" by Sou Fujimoto, which was to connect the Sava port to the fortress, but the project was scrapped after 2013 when the