Since Google began mapping the world with Google Earth and Google Street View, an entire pastime - Google mystery hunting and debunking - has cropped up. From unidentified flying objects to people with horse heads, there's no shortage of weird things that have appeared on Google Earth and Street View.

Who Is the Horse Boy?

Google Earth Horse Boy

A man wearing a horse mask has made several appearances on the streets of Aberdeen, Scotland, intriguing the internet. He appeared on two different occasions, and, even more mysteriously, Google removed the pictures of him from Street View (but you can still see him preparing to put on his mask in this photo). Nobody knows who the man is or why he's wearing a horse mask, but he has definitely sparked some interesting photo responses. PC Advisor staffers remain convinced it's contributor Lexton Snol, but he's not speaking.

See also: 11 funny UK sights on Google Street View

Smoke Monster?

Google Street View Smoke Monster

The Street View cameras captured this strange cloud (or smoke) formation in an Italian town. It's unknown whether this is camera dust or some sort of flare, but the formation looks a lot like the smoke monster from the hit TV series Lost.

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See also: The 16 strangest sights in Google Earth