In many places all over the world tonight is the scariest night of the year, it's Halloween!
But did you know Greenland has its own version of this holiday? The scary festival is celebrated in winter, on January 6, and it's called Mitaartut - which means "disguised people".
Both kids and adults dress up beyond recognition, and walk from house to house to frighten relatives and friends; even the face must be completely covered with masks or tied up with strings, to make it really hard to be recognized.
The origin of this tradition is uncertain, but it's probably a mixed of Inuit folklore and the religious holiday of Epiphany.. The result is an impressive, unique celebration.