If you want to stand on two hemispheres at the same time, visit this place where the meridian divides the Earth. It is located at the Royal Greenwich Observatory and was established in 1851 by an English mathematician - Sir George Biddell Airy.
The prime meridian with longitude 0º is the reference line for the Greenwich Mean Time; it means that every new year starts at this line.
While in the area, be sure to visit the surrounding museum and observatory to learn more about the Universe, astronomy and the meridian line itself. Flamsteed House, one of the oldest parts of the complex, is also worth visiting.
Last admission 30 min before closing.
Royal Observatory Entry:
Children over 7: £7.20
Official website http://www.rmg.co.uk/royal-observatory/flamsteed-house-and-meridian
Phone +44 20 8312 6608
Address Greenwich, London SE10 9NF, UK
Coordinates 51°28'40.641" N -0°0'5.351" E