The Guayabo de Turrialba is an archaeological site located in the Cartago Province of Costa Rica. The site is one of the few architectural remains of the pre-Columbian era in Costa Rica, and is the nation's largest ancient architectural site. Guayabo is assumed to have been a town or city, due to remains of stone paved streets, aqueducts, housing foundations, drawings of animals and stone carvings. The artefacts found in Guayabo date back to approximately 1000 BC, however it is still not confirmed as to why the site was abandoned by civilisation. A potential reason is the close proximity of Guayabo to the Turrialba Volcano. The area is also prone to high magnitude earthquakes, with the area being located at the centre of a series of intersecting fault lines. Furthermore, the location of Guayabo is very secluded, situated in the mountains of Guayabo national park. It can take up to an hour to travel there, requiring a car and hiking. In 1891, an excavation was conducted in a cemetery in Guayabo, with artefacts from the excavation being displayed at the Historical American Exposition at Madrid and then the World's Columbian Exposition in Madrid.