El Templo Mayor de la Gran Tenochtitlan se erige imponente con sus 82 metros por lado y casi 50 metros de altura en el corazón de la Ciudad de México. Los cimientos del cielo, una producción que narra desde el origen tribal de los mexicas, hasta el resurgimiento de las ruinas de la gran ciudad en la época actual, sintetiza la tragedia y la gloria de México-Tenochtitlan. A través de imágenes de archivo de las excavaciones, de los descubrimientos más importantes, entrevistas con especialistas y con efectos y animaciones realizadas por computadora, se narra cómo se llevó a cabo la fundación de México-Tenochtitlan, la llegada de los españoles encabezados por Hernán Cortés, la destrucción de la ciudad para edificar la ciudad colonial, y el resurgimiento de las ruinas del Templo Mayor tras el hallazgo de la escultura monumental de la diosa de la Luna, Coyolxauhqui.
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