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Machu Picchu
The Hanging Church, Cairo — built atop the southern gatehouse of a Roman fortress, its nave suspended over the ancient gateway. Inside, 110 icons and carved ivory panels span nearly 1,700 years of continuous Christian worship. One more layer of Cairo's improbable density of history, compressed into a city most visitors see only through the lens of the pharaohs.
© Daniel Mayer, CC BY-SA 4.0, via Wikimedia Commons