The Kansas City Star reports that Peruvian authorities made a stunning new discovery at the site of Era de Pando in the Supe Valley. The region was home to the Caral culture, which is often considered the oldest city-building civilization in the Americas. Previous excavations at Era de Pando have unearthed four large and four small pyramid complexes, and at least 40 other buildings, including houses and temples, that date back at least 4,000 years. While working near one of the largest pyramids, archaeologists recently uncovered the ruins of a structure known as a "fire altar." The circular feature, which...