Explaining: the history of the UN headquarters

Before it became the headquarters of global cooperation, the site of the UN headquarters in New York was known for its foul smell. That's because slaughterhouses lined the block.

The UN buildings were designed by 11 architects and built in 1947 for the equivalent of $130.2 million in today's money. The territory belongs to no government, and it has its own police force, Ian Bremmer explains on GZERO World.

UN headquarters also features the famous Hall or Flags or the huge General Assembly Hall, where South Korean boy band BTS performed last year, and a first-rate art collection.

Watch the GZERO World episode: How a war-distracted world staves off irreversible damage