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10. Katskhi Pillar, Georgia
The Katskhi Pillar in Georgia is a 130-foot-tall limestone monolith with a tiny church perched on top. Built in the 9th or 10th century, it was once home to hermits seeking isolation. Today, it is inhabited by a monk named Maksim Qavtaradze, who descends only twice a week via a ladder to collect supplies.