CSI: NY's Gary Sinise and Sela Ward flew to San Francisco from the show's L.A. home base to shoot the gripping Oct. 12 episode (8/7c, CBS), which finds their characters, Mac and Jo, embroiled in a puzzling murder case. Along the way they are joined by Jo's ex, FBI agent Cade (thirtysomething's Peter Horton, left, who's guest starring).

The City by the Bay's stunning architecture — including The Palace of Fine Arts rotunda — provided a scenic change of pace for the usually gritty show. Another perk? The trip gave the cast and crew a much-needed break from the intense weather. "It was a treat for our team to escape the 110 degree L.A. heat," says executive producer Pam Veasey. Next up: New York City, where they'll likely film scenes at Central Park and Chelsea Piers.

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