It's one of Ireland's most popular tourist attractions but how many visitors have seen something like this at the County Clare beauty spot? A waterfall flowing upwards!

Well, now we've seen everything! Earlier this month a hiker walking along the Cliffs of Moher with some pals took this amazing footage of what appears to be a waterfall flowing upwards. 

Read more: Magical natural event captured at Cliffs of Moher

Garry McNab took this amazing video and posted it to Reddit, on Nov 4, since then it's gone viral and has even been picked up by ABC News in the United States. 

Take a tour to the Cliffs of Moher with Irish Studio Travel

What's the explanation? High winds, of course.

Winds blowing off the Atlantic Ocean can be fierce and in this case, the wind is literally blowing the water against its natural trajectory. 

While backward flowing waterfalls have been known to exist in particularly strong winds they are a very rare phenomenon, one this hiker and his friends were lucky to witness. 

It's essentially an optical illusion thanks to Mother Nature. 

Ordinarily, the Cliffs of Moher are a lot more tame, although it is, of course, advised to be very careful along the cliffs. The cliffs stretch along five-miles of the coast of the Wild Atlantic Way and they usually offer dramatic views of the ocean that will take your breath away. 

Best to try to visit on a clear day when the sun's out! 

Read more: 325 million-year-old fossil discovered in County Clare

The beautiful Cliffs of Moher, in County Clare. Getty