If Montmartre and Harlem don't spring immediately to your mind as naturally twinned neighbourhoods, then I have one word for you - Jazz. Virtual Harlem is one of the oldest sims you're ever going to walk on. Originally made by the advanced technology center at the University of Missouri-Columbia as part of Bryan Mnemonic's dissertation on 20th century African American literature, it transferred into SL back in 2005, originally by Pleiades Consulting, and the current incarnation is by Mick Huet.
Bryan Mnemonic: Jazz was introduced to Paris by African American troops who fought in WWI under the French flag. Some of them stayed in Paris after the war and were employed at cabarets in Montmartre. The sims are mostly used for my teaching, projects with students researching the period or individuals within the period, and educational events. There is also a lively artist community being constructed on Montmartre, mainly led by Indea Vahlor in SL. She and her other colleagues have created exhibits, and there are jazz and poetry events held at various locations on both Harlem and Montmartre. For the past 6 years, I've had a partnership with the Sorbonne, and in November I'll be back in Paris, coordinating with students, who occasionally add authentic content to either Montmartre or Harlem.
Speaking of authentic content, you may have noticed that Chrome Underwood has been around a little less lately. That's because he's in the middle of writing a memoir of artist Mick Brady, including