Of the original Seven Wonders of the Ancient World, only one wonder still exists today: the crumbling, gorgeous Great Pyramids of Giza. But there are plenty of other ancient structures that deserve our attention too, from a 2,000-year-old church to a more than 1,000-year-old Buddhist temple that's made out of timber. Even more remarkable? All of these building are still in use. Check out 17 of these tributes to human engineering, below.
The Santa Sophia (also known as Hagia Sophia) in Istanbul, Turkey has been church, mosque and museum since it was completed in 537 AD.
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