From the World Heritage inscription:
The ensemble of buildings at Greenwich, an outlying district of London, and the park in which they are set, symbolize English artistic and scientific endeavour in the 17th and 18th centuries. The Queen’s House (by Inigo Jones) was the first Palladian building in England, while the complex that was until recently the Royal Naval College was designed by Christopher Wren. The park, laid out on the basis of an original design by André Le Nôtre, contains the Old Royal Observatory, the work of Wren and the scientist Robert Hooke.
Greenwich is a really interesting place to visit. It is the location of the Prime Meridian and is where the clocks made by John Harrison, who solved the problem of longitude, are located. Greenwich is not connected to the underground, but is easily accessible from central London by train or ferry. This is not on everyone’s itinerary when they visit London, but really should be.
View my complete list of UNESCO World Heritage Sites