Tokyo is the most populated of Japan's 47 prefectures. In Tokyo, there are 42 buildings and structures that stand taller than 185 metres (607 ft). The tallest structure in the prefecture is Tokyo Skytree, a lattice tower that rises 634 metres (2,080 ft), which was completed in 2012. It also stands as the tallest structure in Japan, the tallest tower in the world and the 2nd-tallest freestanding structure in the world. The tallest building and third-tallest overall structure in Tokyo is the 256-metre-tall (838 ft) Toranomon Hills, which was completed in 2014. The prefecture's second tallest building is Midtown Tower, which rises 54 stories and 248 metres (814 ft) in height.