I've spent some time today learning about a place new to me, Mt. Athos. New to me, but very, very old.
See the three fingers/peninsulas, sticking out into the Aegean Sea, in northern Greece? The one on the far right is Mt. Athos.
They eat fish but no meat.
They sleep only about 3 hours each night.
They worship about 8 hours each day.
They have no days off, nor vacations.
They almost never leave the peninsula. They do not want to.
They eat two meals each day, quickly.
They are generally very healthy and long-lived.
They follow the Julian calendar, and keep their clocks according to Byzantine time, meaning one day goes from sunset to sunset.
It is extremely difficult to be admitted as a monk here. Many apply and few are chosen.
Unfortunately, no women are ever allowed on the peninsula. Even female livestock are excluded, although they have cats, and they keep hens for their eggs.
Here's a 60 Minutes episode about Mt. Athos that is fascinating to watch: