The magnificent open-air theater at Epidaurus is one of the best preserved from the ancient world. Buried for close to 1,500 years, the stage and 55 tiers of seats—divided into a lower section of 34 rows and an upper section with 21 rows—remain much as they were. Acoustics are so sharp that a stage whisper can be heard at the top of the house. Researchers have demonstrated that the theater’s superb acoustics are due to its limestone seats, which deaden the low-frequency murmurs of the audience while magnifying the higher-frequency voices of the actors.