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.

Hundreds of thousands of people packed the streets of Dublin on Monday to watch Ireland's national St. Patrick's Day parade, as crowds in green flooded cities and towns across the country to honor the country's patron saint.