Baku is the capital of Azerbaijan. It lies along the Caspian sea, closest to the easternmost point of Azerbaijan. With 3.2 million inhabitants, Baku has almost one third of the population of the country. Baku extends for 18km from east to west and 10km from south to north. The historic centre of Baku (İçərişəhər) is surrounded by walls and has been on the UNESCO world heritage list since the year 2000. It actually is relatively unimpressive, since most buildings inside the walls are relatively modern. Baku is a fast developing city with a beautiful 19th and 20th century core and many impressive modern buildings which are continuously added to the city. Along the waterfront there is a park area with a wide promenade. The Flame Towers are on a hill overlooking the city and were completed in 2012.