The Planetarium takes visitors on an audio-visual trip through time and space inside a £17.7m 45 tonne bronze clad cone, tilted at 51.5o to the horizontal (the latitude of Greenwich), and situated aptly on the prime meridian itself. All this for the sum of just £6, which can't be too bad.
Current shows include Invaders of Mars, Sky Tonight Live and Star Life. For more information visit the website at http://www.nmm.ac.uk/visit/planetarium-shows/.
Click here to see the location on a map.