Monday, March 17 is St. Patrick's Day, celebrating all things Irish in the U.S. and around the world. Cities celebrate with parades, bar crawls and more.

It was a sea of green and gold in St. Paul on Monday as thousands gathered to celebrate the city's annual St. Patrick's Day parade. "It's beautiful to see everyone wearing green — no matter what your nationality or where you're from," Dan Kelly said.

People celebrating St. Patrick's Day at an Irish pub in Boston were in for the surprise of a lifetime when pop star Ed Sheeran came in and performed a concert. Sheeran posted on social media Monday night,

Ed Sheeran did St. Patrick's Day right this year, with the superstar performing at a pub in one of the most Irish cities in America: Boston. In a video posted to Instagram Monday (March 17), Sheeran holds a surprise acoustic set at the city's The Dubliner,