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The Colosseum and the Great Wall of China are impressive, but they get too much credit! In this list, we dive (literally, in the case of #12) into some of humanity’s most significant and fascinating architectural creations from bygone eras. Beyond modern-day wonders, these structures are especially impressive because they were constructed by our ancestors in ways we don’t fully yet understand. Bring out your inner explorer and find your next vacation spot in our list of unknown ancient architectural wonders you have to visit.