Researchers work at 1,800-yr-old Pergamon amphitheatre in Turkey(1/5)

An archaeologist does his measurement work at the Pergamon amphitheatre unearthed by researchers from the German Archaeological Institute and the Technical University of Berlin, in Izmir, Turkey, Sept. 22, 2021. (Photo/VCG)

Pergamon amphitheatre, built almost 1,800 years ago, is a theater for gladiatorial or animal fights.

An archaeologist does his measurement work at the Pergamon amphitheatre unearthed by researchers from the German Archaeological Institute and the Technical University of Berlin, in Izmir, Turkey, Sept. 22, 2021. (Photo/VCG)

Pergamon amphitheatre, built almost 1,800 years ago, is a theater for gladiatorial or animal fights.

This photo shows the Pergamon amphitheatre unearthed by researchers from the German Archaeological Institute and the Technical University of Berlin, in Izmir, Turkey, Sept. 22, 2021. (Photo/VCG)

Pergamon amphitheatre, built almost 1,800 years ago, is a theater for gladiatorial or animal fights.

This aerial photo shows the Pergamon amphitheatre unearthed by researchers from the German Archaeological Institute and the Technical University of Berlin, in Izmir, Turkey, Sept. 22, 2021. (Photo/VCG)

Pergamon amphitheatre, built almost 1,800 years ago, is a theater for gladiatorial or animal fights.

This photo shows the Pergamon amphitheatre unearthed by researchers from the German Archaeological Institute and the Technical University of Berlin, in Izmir, Turkey, Sept. 22, 2021. (Photo/VCG)

Pergamon amphitheatre, built almost 1,800 years ago, is a theater for gladiatorial or animal fights.