This is where the last Machu Picchu truth becomes even more intriguing! Peru has a high level of seismic activity in general, and Machu Picchu is positioned near two fault lines. Knowing this, the Incas developed a variety of strategies to make their structures earthquake-resistant. These featured the previously mentioned ashlar construction, as well as trapezoidal-shaped doors and windows, inward inclining walls, and bracing blocks.