To help visitors navigate classical ruins, Greece's Culture Ministry unveiled a hand-held device that offers high-resolution video, site diagrams, position indicators and stereo sound.

The units, with instructions in Greek, English, German and French, will be available by summer 2008 at 15 sites, including the Acropolis in Athens, Delphi, Rhodes and Knossos in Crete. Rental prices have not yet been determined.

The ministry also unveiled new automated ticketing systems for 18 tourist sites, designed to reduce waiting times.