1850

By 1850, the British Empire was the most powerful empire in the history of Earth up to that point.

In that year, the Light infiltrated the empire in the hope of eventually taking control of Earth. (AUDIO: 1963: The Assassination Games)

The Fourth Doctor and Ann Kelso visited Newstead Abbey, Nottinghamshire, where they met Ada Lovelace. (AUDIO: The Enchantress of Numbers)

New York City's total population was 515,547, 235,733 of whom were foreign-born. (TV: The Gathering)