New York's iconic St. Patrick’s Cathedral on Thursday unveiled a massive new mural that honors the city's immigrants.

Spanning every side of the entryway to the Manhattan landmark, the 25-foot artwork, which has been in the works for several years, is the largest permanent artwork commissioned for the church in its 146-year history, according to the Roman Catholic Archdiocese of New York.

The work is titled “What’s So Funny About Peace, Love, and Understanding.”

The mural, by local artist Adam Cvijanovic (pronounced ‘svee-YAHN-o-vich), in part honors Irish immigrants who contributed to the cathedral’s construction.

One part depicts the Apparition at Knock, in which, according to Catholic lore, saints appeared to locals in the Irish village in 1879.

Other scenes show present-day immigrants alongside notable historical figures, including Frances Xavier Cabrini, Félix Varela, Archbishop John Hughes, Saint Kateri Tekakwitha, Gov. Al Smith, Dorothy Day and Pierre Toussaint.

AP video shot by Ted Shaffrey