The Tower of London is one of London's most admired and heroic traveler attractions. Constructed by William the Conqueror in the early 1080s the Tower's responsibility has been as a stronghold, palace and jail. One of the main reasons to stopover the Tower is to see the functioning collection of Crown Jewels. It comprises of 23,578 gems in the collection counting one of the world's most famous diamonds; the Koh-i-Noor from India. Unusual animals were given as royal offerings and animals were placed at the Royal Menagerie for the amusement and interest of the court. Everything from elephants to tigers, kangaroos, polar bears, and elephants and ostriches existed in what was known as the Royal Menagerie.