One of the oldest cemeteries in Peru, the Ventanillas de Otuzco dates back more than 3,500 years. The ancient necropolis, 8 km (5 miles) northeast of Cajamarca, is comprised of several large burial niches carved into a cliff. From afar the niches look like windows, hence the area's name. On closer inspection you see that many of the burial niches have carved decorations. Sadly, the site is slowly being eroded by wind and rain, though measures are being put in to place to slow the degradation. If you're inspired by this cemetery, you can go about 30 km (18 miles) from Combayo, in the same direction, and visit the better-preserved Ventanillas de Combayo. A three-hour guided tour to Ventanillas de Otuzco costs around S/35.