A recent twittersation with @rollohome had me pull out these screen shots from Google Maps - it doesn't appear to give proper driving directions around complex British roundabouts - I thought this was a curious counterpoint for Earth Day, as we go round&round...
Swindon magical roundabout is the most famous example, but this dragged two examples out of my distant memory, when I lived in Walton-on-Thames, Surrey around the new millenium.
Hatton Cross roundabout on the east side of London Heathrow airport - I used to show visitors the hangars storing half a dozen Concordes* at the time, much to my daughter's delight.
Pregnant roundabout going to Garson garden centre near Esher, Surrey - nearby are the Epsom Downs, where I learned a geo-curiosity of the English language, that downs are in fact up (hills).
*: interestingly enough, Bing Maps 3D still shows a Concorde parked outside Heathrow, even though I don't recall seeing them there recently.