Greenwich, part of London but just far enough away from the center to make it seem like a place apart. It's not even on the underground network, you need to take the Docklands Light Railway, itself an interesting journey through Canary Wharf along the way.
But back to Greenwich, of all the London boroughs outside of Westminster and The City of London, Greenwich offers the most diverse sights.
Alongside the river is the old Royal Naval College, there are some fabulous Georgian buildings on the site that you can visit. It's also home to the National Maritime Museum.
Nearby is the restored, Cutty Sark (picture), one of last British clippers built in 1869.
If you're feeling adventurous, right next to the Cutty Sark is the entrance to the Greenwich foot tunnel that connects Greenwich with Millwall, on the north side of the river Thames.
South of the old Royal Naval College, Greenwich boasts its own royal palace, the Palace of Placentia, originally a 15th century building but the one we see today was rebuilt in 1660.
Behind the Palace of Placentia, stretches the enormous Greenwich park, head up the hill and you come to the world famous Greenwich Royal Observatory (in fact there are several buildings spread over the site that make up the observatory). Originally commissioned in 1675 by King Charles II, it played a major role in the history of astronomy and navigation. The prime meridian runs through Greenwich for this very reason and the time zone known as Greenwich Mean Time obviously originated here.
You can easily spend a day at Greenwich and it is different from the rest of London.