To help mark the 70th anniversary of the United Nations, more than 350 iconic monuments, buildings, landscapes, museums, bridges, and other landmarks in more than 80 countries across the globe were lit up blue - the official colour of the United Nations - on UN Day, 24 October 2015.

See the full list here: blogs.un.org/blog/2015/10/09/turn-the-world-unblue/#sthas...