This is world-famous Brazilian Carnival which takes place every year in mid-February. ( this is from 2010). Though most of the action takes place on the streets and block parties, these photos are from the official parade that takes place inside a huge, purpose-built stadium (the Sambodromo) and lasts all night for several consecutive days. The production is massive and very elaborate, with costumes and props costing around $250 million (our tickets were around $600 each, so I suppose that’s how the costs are covered!)
Be sure to watch the HD video as well to get the full experience with the accompanying dances and samba music.