Machu Picchu is facing a new threat: streakers.

[ana_pirogova]

It has survived five centuries of conquest, earthquakes, landslides and mass tourism. But Peruvian authorities fear that Machu Picchu is facing a new threat: streakers.

Guards at the vast Inca citadel have been ordered to step up surveillance after a spate of stripping. Late last year, two male antipodean travellers were detained by guards after baring their backsides at the site – but not before a picture of their exploits went viral on Peruvian social media.