We busted out the goggle strap mount and found some black diamonds -- and some green dots, too.

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"All media in Greece is corporately owned: people here believe it's aligned to the very same forces that have ripped off the country so there is total hostility to them, " explains Antonis, a student, who is guiding me around the square, as we shield our camera and eyes from the roving green dots.

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And lungworts (Pulmonaria), one of the first shade-loving perennials to return each spring, have white polka dots covering their spiky green leaves.

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So, with the dramatic backdrop of the Champs Elysees beckoning, Sastre has the yellow jersey, Oscar Freire the green, Bernard Kohl the polka dots, and Andy Schleck the white.

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As a slight rain started to fall, each woman opened a wide umbrella, a rainbow of polka dots popping up amid the ocean of green.

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At each different location visitors collect a green dot, and the tour is complete when they've collected six dots.

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