There are a lot of good builds in OpenSim, but some are beyond good - for the attention to rl details, for the exceptional building skills, for the atmosphere created on the sim.
French creator Erwan Elan has a lot of lovely regions on his Serenity Grid, but perhaps the best of all of them is his bravura re-creation of Giverny, in Normandy, the famous home of the Impressionist painter Claude Monet.
Inside and out, this is hands down the best Monet inspired build you are likely to ever see. Erwan's feel for his subject matter, his thorough research and dedication, radiate out of every texture, and his clever use of the excellent plant resources in opensim (Jimmy Olsen and Imperator Janus spring to mind) thoroughly meet the task he sets for them.
If you have spent any time at all at Giverny in the real world, you'll probably have a story to tell about long queues, an international crowd shuffling dully through the carefully organized garden trail, or about how you went there on a cloudy day, or when the flowers were not looking their best. That is a pretty common experience that you can totally avoid by going to this virtual version of the old farmhouse and two acre garden laid out by Monet and his family in the late 1800's. It is on Serenity Grid, the address is, as always, at the end of the post.