Watch out for bare butts when traveling in Machu Picchu -- incidents of "naked tourism" at the 15th-century Inca citadel are on the rise, and getting under the skin of Peru officials. 

According to the Peruvian Times, four American tourists were detained on March 14 for getting naked and posing for photos at the site. 

In a pair of separate incidents earlier in the week, two Canadians and two Australians were detained for stripping down for pictures at Machu Picchu. 

The bare-it-all episodes followed a 2013 incident in which a naked couple was videotaped by other tourists while streaking across Machu Picchu's grass field and bounding down a stone staircase like a pair of adolescent antelopes. 

The website My Naked Trip features images of an Israeli man named Amichay Rab posing in the buff at sites around South America, including Machu Picchu. 

Rab's long, curly hair and bold poses have won him a cluster of followers. 

The photos and video have made the rounds on social media. 

Peruvian officials are not amused. 

Crackdown 

Peru's Ministry of Culture has denounced the spectacle of nude visitors at Machu Picchu as "disrespectful" and "unfortunate events that threaten cultural heritage." 

"There are places in the world that people can get naked, but not all places are (appropriate) for getting undressed," Alfredo Mormontoy Atayupanqui, director of archaeological resources for Peru's Ministry of Culture, tells CNN. 

According to Mormontoy, park rules printed on the back of admission tickets warn visitors against being nude in public. 

"Tourists should comply with local rules and regulations when they are traveling, otherwise there will be thousands of problems," he says. 
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Machu Picchu
Machu Picchu
A 15th-century Inca citadel
15th-century Inca citadel
incidents of "naked tourism"
 incidents of "naked tourism"
Peru officials are
Peru officials
American tourists were detained
American tourists were detained
March 14
March 14
four
four
getting naked and posing for photos at the site
getting naked and posing for photos at the site
the Peruvian Times
the Peruvian Times
Yes
 two Canadians and two Australians
two Canadians and two Australians
two Canadians and two Australians
stripping down for pictures
stripping down for pictures
Yes
a 2013 incident 
a couple
a naked couple
streaking across Machu Picchu's grass field
streaking across Machu Picchu's grass field
2013
2013
park rules warn visitors
park rules printed on the back of admission tickets warn visitors 
on the back of admission tickets
on the back of admission tickets
being nude in public
being nude in public
Alfredo Mormontoy Atayupanqui
Alfredo Mormontoy Atayupanqui