Theater at Epidaurus - Greece. The theater, dating to the 4th century B.C. and arranged in 55 semi-circular rows, remains the great masterwork of Polykleitos the Younger. Audiences of up to 14,000 were able to hear actors and musicians--unamplified--from the back row of the architectural masterpiece.
Mystras. It's truly amazing to find a complete ruined city and archaeological wonderland. The abandoned Byzantine city of Mystras in the mountains just above Sparta in the Southern Peloponnese, is one such frozen city. You can walk through the largely intact streets and complete religious buildings of this UNESCO World Heritage Site and be right back in 1350 AD.
The Theatre of Priene, one of the largest of the early Greek theatres, could seat 5000 spectators. Special front row seats (prohedria) were added later for important guests. Archaeological Site, Priene, Turkey
Lions Gate, 1300-1250 BCE, Mycenae Greece] The Lion Gate consists of two monoliths surmounted by a triangular stone sculpture in which a central pillar of Minoan type is flanked heraldically by a pair of high relief lions.