Explore the ancient site of Ollantaytambo in Peru’s Sacred Valley, one of the largest Inca and pre-Inca megalithic complexes.

NOVA: What was your first impression of Machu Picchu? Ken Wright: When I arrived in 1994, my first visit ever, I was blown away by the view of Machu Picchu itself and also by the surrounding territory ...

Can modern engineers learn best practices from ancient road builders? Modern road construction often relies on modifying the landscape by blasting through rock, which can result in landslides. Because ...

Karen Klotz, Michael Sanio, ASCE director of International Alliances and ASCE President-Elect Wayne Klotz peer through a reconstructed doorway in the Incan citadel of Machu Picchu in Southern Peru.

Beneath the stone-paved streets of Cusco, a city layered with centuries of Andean and colonial history, researchers have located what may be the most significant Inca discovery in recent years. For ...

LATACUNGA, Ecuador — The Royal Inca Road has needed repairs for most of the last 450 years, ever since the Spanish conquest of the Incan empire. This 3,250-mile highway, once an engineering marvel ...

I saw the evidence of Inca engineering skill in the tour that took me to Machu Picchu.Only in hindsight, when I was preparing to write about it, did I begin to fully appreciate the Inca Empire's ...