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Most people around the globe look at some form of a calendar every single day. Business executives check to see when their meetings are scheduled. The busy mom confirms soccer practices and piano lessons. College students ensure that their papers are turned in on time and they have plenty of time to study for exams. For the people of ancient Maya, calendars were just as important to daily life as they are to people today.
The caves in Meteora, Greece, had inhabitants for fifty millennia, but due to raids, “hermit monks” moved to the safety of sandstone rock pinnacles in the 9th century and began building monasteries. More monks and nuns came, building more monasteries perched high upon the cliffs. Wikipedia reports, “Access to the monasteries was originally (and deliberately) difficult, requiring either long ladders lashed together or large nets used to haul up both goods and people.