There are a large number of sites with impressive platform mounds, plazas, paved roads, stone sculpture, and artifacts made from jade, gold, and ceramic materials. These include Las Mercedes, Guayabo de Turrialba, Cutrís, and Cubujuquí in Costa Rica and Pueblito ( in Tayrona National Natural Park) and Ciudad Perdida in the Sierra Nevada de Santa Marta of Colombia. Research at sites such as Rivas, Costa Rica helps to document the configurations of large settlements in the centuries prior to the Spanish Conquest. Some of the best-known Isthmo-Colombian sculptures are the stone spheres of Costa Rica. Another area that has provided valuable archaeological information is the Gran Coclé region in Panama, largely coinciding with the modern-day Coclé Province.