Sooner or later almost everyone in Athens, tourist or local, heads for the flea market, the city’s oldest bazaar, below Monastiraki Square. Although it’s busiest on Sundays, all week long you can rummage through the antiques – furniture, bric-a-brac, mirrors, paintings, vintage toys, statuettes, vases, silverware – spread out in colorful disorder in front of the small shops that line all four sides of Avissinia Square.