Flea Market
In Athens, the Flea Market has two meanings. The sign next to Monastiraki station at the beginning of Ifaistou Street claims that you are entering "the Flea Market of Athens." Actually, that street is lined with second-hand and surplus shops of every description. Few of them are of much interest to the visitor, though towards the west end of the street there are some interesting shops selling old books, posters, and Greek and other music recordings. The real Flea Market is held on Sunday mornings in Plateia Avissinia at the western end of Ifaistou Street. There you will find an incredible assortment of used objects, antiques, and junk.
Martinos
Among all the souvenir and second-hand stores in the area, Martinos at 50 Pandrossou tel. 210/321-3110stands out as a genuine antique shop, offering top quality items from Greece and the Eastern Mediterranean. Prices are also top of the line, so this is a shop for knowledgable antique buyers in the market to do some serious spending. Remember that taking antiques out of Greece and into your own country may be subject to the laws of both countries and be sure you're familiar with them before taking anything old home.