2Mount Athos, Greece

For more than a thousand years, Eastern Orthodox monks have been living in the monasteries in Mount Athos. They continue to do so, and welcome a limited number of visitors to this Greek peninsula, providing they’re men. They’ve never allowed women to visit the mountain, and they have no intention of doing so in the future.

Even female animals aren’t allowed to be kept. That means eggs and dairy products have to be brought in from outside the peninsula. However, they’ve made an exception for cats. After all, someone’s got to deal with the mouse problem.