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Hagia Sophia in Istanbul, constructed 532-537, continues to be revered as one of the most important structures in the world. Hagia Sophia (Greek Ἁγία Σοφία, for 'Holy Wisdom') was designed to be the major basilica of the Byzantine Empire...

Inca architecture includes some of the most finely worked stone structures from any ancient civilization. Inca buildings were almost always practical and pleasing to the eye. They are also remarkably uniform in design with even grand imperial...

Kukulcan (pron. Koo-kool-kan) is the name of a feathered serpent god in the mythology and religion of Mesoamerica, in particular, the Yucatec Maya. He is also identified as the feathered serpent god Quetzalcóatl by the Toltecs and Aztecs...

Persepolis was the capital of the Persian Achaemenid Empire from the reign of Darius I (the Great, r. 522-486 BCE) until its destruction in 330 BCE. Its name comes from the Greek Perses-polis (Persian City), but the Persians knew it as Parsa...

The Indus Script is the writing system developed by the Indus Valley Civilization and it is the earliest form of writing known in the Indian subcontinent. The origin of this script is poorly understood: this writing system remains undeciphered...

Ancient Argos, located in the Peloponnese in Greece, was a major Mycenaean settlement in the Late Bronze Age (1700-1100 BCE) and remained important throughout the Greek, Hellenistic, and Roman periods until its destruction by the Visigoths...

A mandala (Sanskrit for “circle”) is an artistic representation of higher thought and deeper meaning given as a geometric symbol used in spiritual, emotional, or psychological work to focus one's attention. The image first appears in India...

Euclid of Alexandria (lived c. 300 BCE) systematized ancient Greek and Near Eastern mathematics and geometry. He wrote The Elements, the most widely used mathematics and geometry textbook in history. Older books sometimes confuse him with...

The Library of Celsus in ancient Ephesus, located in western Turkey, was a repository of over 12,000 scrolls and one of the most impressive buildings in the Roman Empire. Constructed in the 2nd century CE, it was named after the city's former...

Teotihuacan, located in the Basin of Central Mexico, was the largest, most influential, and most revered city in the history of the New World. It flourished in Mesoamerica's Golden Age, the Classic Period of the first millennium CE. Dominated...