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This massive stone fortification stretching over 13,000 miles was built to protect China's northern borders from invaders.
Difficulty: EasyThis female pharaoh, one of Egypt's most successful rulers, wore a false beard and was depicted as a man in official art.
Difficulty: MediumThis Aristotelian term describes the tragic hero's error or flaw that leads to their downfall, distinct from moral vice.
Difficulty: HardSiddhartha Gautama, born a prince in Nepal around 563 BCE, founded this major world religion after achieving enlightenment.
Difficulty: EasyThe name "Mesopotamia" comes from this ancient language and means "land between the rivers."
Difficulty: MediumThis Roman law of 218 BCE prohibited senators from owning large ships, forcing them into land investment and away from commerce.
Difficulty: HardThis ancient South American empire was centered in the Andes Mountains and became the largest empire in pre-Columbian America.
Difficulty: EasyThis site in Rajasthan, India, is notable for fire altars that suggest ritual practices and possible connections to later Vedic traditions.
Difficulty: Medium