Look out over the Thames from the Royal Observatory, situated on a hill in Greenwich Park. The observatory has played a major role in the world history of astronomy and navigation; you will get the chance to stand on the prime meridian – a line of longitude defined to be 0°, established by Sir George Airy in 1851. Explore the intricacies of Flamsteed House as well, designed by Sir Christopher Wren, and home to the Astronomers Royal, Camera Obscura and the Octagon Room. Admission is ticketed.
