A sweeping view of the Pyramid of the Moon’s plaza is shown at the ruins of Teotihuacán in the Valley of Mexico. The ancient city, which was founded around 2,000 years ago, is one of history’s greatest mysteries. Click to read my travel guide “How to Take a Self-Guided Tour of Teotihuacán,” or click to browse my high-resolution photo collection from the Teotihuacán ruins.
