Tren a las Nubes runs along the high Andes desert of Argentina.
In 1972, it began operating as a tourist train, showcasingthe mountainous desertof northwestern Argentina.
It is one of the few remaining passenger trains in Argentina.
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The train is a three-hour roundtrip journey from the tiny town of San Antonio de los Cobres.
It sits 12,385 feet above sea level and requires a three-hour drive from the neighboring city of Salta.
The journey by car or taxi is three hours, while the bus takes five hours.
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(The bus leaves Salta at 7 a.m. and makes stops at various sites along the way.
Upon arrival in San Antonio de los Cobres, passengers board the train and begin theascent into the clouds.
It also marks the highest point of the journey, at an elevation of 13,850 feet above sea level.
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Shortly after crossing the viaduct, the train turns around and returns to San Antonio de los Cobres.
The bus meets the train, taking travelers back to Salta.
The full experience, which includes the bus ride to and from Salta, takes around 13 hours.
