A group of tourists listens to a guide during a visit at the hill of the Acropolis in Athens July 3, 2013. Greek tourism revenues are expected to bounce back this year to pre-crisis levels, the industry said. The Mediterranean country has pinned its hopes on its sun-drenched beaches and ancient monuments to pull itself out of a deep recession. Tourism is the Greek economy's biggest cash-earner, accounting for about 17 percent of output. REUTERS/Yorgos Karahalis (GREECE - Tags: SOCIETY TRAVEL BUSINESS)