Battersea Power Station has made it onto a lost of world monuments with threatened heritage, along with two other sites in London.
Deptford Dockyard dates back to 1513 and was built on the orders of Henry VIII. It was the administrative headquarters of the Navy from the Tudor era and later became home to a burgeoning community of shipyard workers.
Sayes Court Garden was established by writer John Evelyn in south east London in 1653. The plot was once hailed as one of the capital's greatest gardens.
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Hundreds of pupils from Alperton Community School in Brent, London,cheered and waved flags as Andria Zafirakou arrived holding the prize.
Earlier, this week Kensington and Chelsea Council admitted spending almost £21 million keeping survivors in hotels.
Defence Minister Tobias Ellwood sais the UK is going through a "dark chapter" .