Pre Columbian spheres, image on Flickr by user Anita363. CC BY-NC 2.0.

Four archaeological sites with pre-Columbian stone spheres located in the canton of Osa, Puntarenas, in Costa Rica were included in UNESCO's World Heritage List.

The decision was announced on Monday, June 23, 2014, during the 38th session of the World Heritage Committee in Doha, Qatar.

Costa Rican former president Laura Chinchilla expressed her gratitude for the news on her Twitter account:

Gracias @UNESCO_es por haber creído en nuestra propuesta y declarar Parque Arqueológico de Esferas Precolombinas #patrimoniomundial

— Laura Chinchilla M (@Laura_Ch) junio 23, 2014

Thanks UNESCO for having faith in our application and including the pre-Columbian spheres archaeological park in the list.