The Inca Bridge near Mendoza, Argentina, South America

The Inca Bridge near Mendoza, Argentina, South America

Backpacker crosses bridge over Urubamba River, on the Inca Trail, Peru, South America

Inca natural bridge, volcanic sediment, Mendoza district, Argentina, South America

The Inca Bridge (Puente del Inca) at sunset, Central Andes, Mendoza Province, Argentina, South America

Puente del Inca natural bridge of travertine, near Mendoza, on Argentine side of Libertadores Pass over Andes, Argentina, South America

The Inca Bridge (Puente del Inca), Central Andes, Mendoza Province, Argentina, South America

Puente del Inca, natural stone bridge, Mendoza, Argentina

Last intact Inca rope bridge made of braided Peruvian feathergrass (Jarava ichu), across River Apurimac, Peru, South America

Qu'eswachaka suspension bridge, rope bridge made of woven Peruvian Feathergrass (Stipa ichu), over the Apurimac River, last known working Inca suspension bridge, national cultural heritage of Peru, Southern Peru, Peru, South America

Qu'eswachaka suspension bridge, rope bridge made of woven Peruvian Feathergrass (Stipa ichu), over the Apurimac River, last known working Inca suspension bridge, national cultural heritage of Peru, Southern Peru, Peru, South America

Suspension bridge Q'iswachaka from the Inca era, rope bridge of braided Ichu grass (Jarava ichu) over Rio Apurimac, Canas province, Peru, South America

Puente del Inca, natural stone bridge, Mendoza, Argentina

Last intact Inca rope bridge made of braided Peruvian feathergrass (Jarava ichu), across River Apurimac, Peru, South America

Puente del Inca with ruins of spa compound, Puente del Inca, Las Heras, Mendoza province, Cuyo, Argentina, South America

Former spa by Puente del Inca, a natural arch that forms a bridge with sulphur deposits over the Vacas River, a tributary of the Mendoza River, Mendoza, Argentina

Hikers on the Inca Trail passing over the Urubamba River on a suspension bridge near Chilca on the way to Machu Picchu, Peru

Small cable car holding passengers suspended over the Urubamba River near Cuzco useful technology where there are no bridges, Andes Mountains, Highlands, Peru

Famous Incan grass-rope suspension bridge across Apurimac River rebuilt annually since Incan period and only one still in existence, Inca Road, Altiplano, Peru

Famous Incan grass-rope suspension bridge across Apurimac River, rebuilt annually since Incan period and only one still in existence, Inca Road, Altiplano, Peru

Famous Incan grass-rope suspension bridge across Apurimac River rebuilt annually since Incan period and only one still in existence, Inca Road, Altiplano, Peru

Famous Incan grass-rope suspension bridge across Apurimac River rebuilt annually since Incan period and only one still in existence, Inca Road, Altiplano, Peru

Famous Incan grass-rope suspension bridge across Apurimac River rebuilt annually since Incan period and only one still in existence, Inca Road, Altiplano, Peru

Famous Incan grass-rope suspension bridge across Apurimac River rebuilt annually since Incan period and only one still in existence, Inca Road, Altiplano, Peru

The Sacred Valley of the Incas with a suspension bridge crossing the Urubamba River outside the town of Huasaq, Highlands, Peru

Small cable car holding passengers suspended over the Urubamba River near Cuzco useful technology where there are no bridges, Andes Mountains, Highlands, Peru

View old building under natural bridge in valley and church in distant, Inca Bridge, Mendoza, Argentina

View old building under natural bridge in valley, Inca Bridge, Mendoza, Argentina

View old building under natural bridge in valley, Inca Bridge, Mendoza, Argentina