Royal Observatory & Prime Meridian: Early Access + Guided Tour

Founded in 1675, the Royal Observatory is Britain’s oldest scientific institution. Get a chance to see it before the crowds arrive. You'll stand on the Prime Meridian and step into the birthplace of modern astronomy. Your knowledgeable guide will explain the history of Greenwich Mean Time (GMT) and the search for longitude. See the Octagon Room, designed by Sir Christopher Wren, and enjoy a tour that brings to life the stories of how the Prime Meridian was established in Greenwich.