In the surrounding hills of the village of San Andres de Pisimbala are several groups of underground burial chambers, also known as Tierradentro. Not much is known about the ancient culture that left these behind, but it is believed that the tombs are from 6th to 9th centuries AD. The inside of the chambers were painted in bright geometric patterns and creatures, and to this day it can still be seen in the best preserved ones. A visit to all four sites (Segovia, El Duende, Alto de San Andres and El Aguacate) will at least require a day's walking in the beautiful mountains and will also include the site of El Tablon where mystical stone statues, similar to the ones at San Agustin, can be seen. It is the only place in the Americas where such tombs have been found, and a wonder why they are so seldomly visited.