Sotheby's Wants to Open... a Farmer's Market: In an unlikely move, the auction house is proposing a youth-run farmer's market in front of its Upper East Side headquarters, after a sale of heirloom produce raised $100,000 for non-profits last year. The plan went before the community board this week, and DNAinfo reports: "Some were supportive of the small-scale event that would bring fresh food to the area... Others were more skeptical and wanted to know where the kids manning the stand on between East 71st and 72nd streets — on Sept. 6, 13, 20 and 27 — and the produce would be coming from." Camping in New York... City: The National Parks Service announced plans to turn Brooklyn's Floyd Bennet Field, a decommissioned airport once used by Amelia Earhart, into the country's largest urban campground. Ninety camp sites have been planned for the next two years, with as many as 600 in the future. Floyd Bennet Field already has occasional summer camping nights, which the NYTimes Frugal Traveler tried out for $20 last year. How IBM Re-Defined Corporate Architecture: Big Blue celebrates its 100th anniversary this week, and Network World takes a look at the company's greatest architectural gems. The company hired some of the biggest names, including Eero Saarinen, Charles and Ray Eames, Paul Rand, and Ludwig Mies van der Rohe, to design its modernist offices and later suburban corporate campuses. Martin Moeller at the National Building Museum calls IBM the "vanguard" in using buildings to express corporate identity. America's Dirtiest Cities: Travel and Leisure just released its list of worst offenders. New Orleans, Philadelphia and Los Angeles top the list. Readers chose the "winners" based on litter, air pollution, and the taste of local tap water, in the magazine's annual America’s Favorite Cities survey.