Varna (Bulgarian: Варна, pronounced [ˈvarnɐ]) is the largest city and seaside resort on the Bulgarian Black Sea Coast, with a population of 334,466 inhabitants as of 2015, while 417,867 live in its functional urban area. Varna is a major tourist destination, a business and university centre, seaport, and headquarters of the Bulgarian Navy and merchant marine. In 2008, Varna was designated seat of the Black Sea Euro-Region by the Council of Europe. The oldest gold jewelry in the world, belonging to the Varna culture, was discovered in the Varna Necropolis and dates to 4200-4600 BC. City landmarks include the Varna Archaeological Museum, exhibiting the Gold of Varna, the Roman Baths, the Battle of Varna Park Museum, the Naval Museum in the Italianate Villa Assareto displaying the museum ship Drazki torpedo boat, the Museum of Ethnography in an Ottoman-period compound featuring the life of local urban dwellers, fisherfolk, and peasants in the late 19th and early 20th century. The "Sea Garden" is the oldest and perhaps largest park in town containing an open-air theatre (venue of the International Ballet Competition, opera performances and concerts), Varna Aquarium (opened 1932), the Festa Dolphinarium (opened 1984), the Nicolaus Copernicus Observatory and Planetarium, the Museum of Natural History, a terrarium, a zoo, an alpineum, a children"s amusement park with a pond, boat house and ice-skating rink, and other attractions. The National Revival Alley is decorated with bronze monuments to prominent Bulgarians, and the Cosmonauts Alley contains trees planted by Yuri Gagarin and other Soviet and Bulgarian cosmonauts. The Garden is a national monument of landscape architecture and is said to be the largest landscaped park in the Balkans. The city beaches, also known as sea baths (морски бани, morski bani), are dotted with hot (up to 55°С/131 °F) sulphuric mineral water sources (used for spas, swimming pools and public showers) and punctured by small sheltered marinas. Additionally, the 2.05 km (1.27 mi) long, 52 m (171 ft) high Asparuhov most bridge is a popular spot for bungee jumping. Outside the city are the Euxinograd palace, park and winery, the University of Sofia Botanical Garden (Ecopark Varna), the Pobiti Kamani rock phenomenon, and the medieval cave monastery, Aladzha.