Tourism in Peru tourism forms the largest sector of the tourism industry in Peru. Pre-Columbian civilizations – most notably the Inca Empire, Chavín, Moche, and Nasca – left a large archeological and cultural impact on the nation. The ruins of Machu Picchu are the most internationally recognized of all the ruins of Peru and therefore receive the most tourists. The other popular ruins are those of Chan Chan, Sipán, Kuelap, Nazca Lines, Ollantaytambo, Caral, Sacsayhuamán, and Sillustani. Tourists also visit the Spanish colonial architecture in many cities in Peru. Some of the most outstanding examples of Spanish colonial architecture are in the cities
Pre-Columbian savannas of North America and 1940s stopped much of the regular burning which the savanna required. By the latter half of the 20th Century many researchers had rediscovered both the prehistoric use of fire and methods to practice burning, but by then almost all prairie and savanna lands had been converted to agriculture or succeeded to full-canopy forest. Modern conservation of savanna includes controlled burning, and at present about a year are burned. Pre-Columbian savannas of North America Pre-Columbian savannas once existed across North America. These were created by both natural lightning fires and by Native Americans. The arrival of European settlers caused the