WATCH: A stunning timelapse of the the Chicago River turning green for St. Patrick's Day 4 years ago

WATCH: A stunning timelapse of the the Chicago River turning green for St. Patrick's Day

The Windy City goes green.

Landmarks all over the world will turn green over the next few days to celebrate St Patrick's Day.

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We'll all celebrate on March 17 but parades are already taking place across the globe and Chicago held their one on Saturday.

To mark the event, the Chicago River, which flows through the middle of the city, went bright green for the day.

YouTuber Peter Tsai captured an awesome timelapse of the city staff making it happen.

Clip via YouTube/Peter Tsai