Monte-Carlo Circus Festival, a traditional puzzle - Stave Puzzles
Amazon.com: Ravensburger Look & Find: Enchanted Circus 1000 Piece Jigsaw Puzzle for Adults - 17482 - Every Piece is Unique, Softclick Technology Means Pieces Fit Together Perfectly : Toys & Games
Three Ring Circus Jigsaw Puzzle by Linda Mears - Pixels