Meanings of great gymnasium in английском

The great gymnasium was not locked.

I did not make much progress towards my house; the crowd in front of the great gymnasium stopped me.

The farm is a great gymnasium, a superb manual training school, nature's kindergarten, constantly calling upon the youth's self-reliance and inventiveness.

Now Sparta, situated in the midst of a numerous conquered population of Messenians and Helots, was partly a great gymnasium and partly a perpetual camp.