New York City, New York

The City that Never Sleeps boasts the oe of the longest running St. Patrick's Day Parades. The tradition started in 1848 and today it has grown to attract more than 2 million spectators to watch more than 150,000 people march. The parade always travels passed the famed St. Patrick's Cathedral, which is a great Catholic site to explore on this Irish holiday.

Savannah, Georgia

The charming city of Savannah boasts one of the largest Irish-American populations per capita, about 8%. They also have one of the longest standing St. Patrick's parades, which started way back in 1824. While visiting Savannah, be sure to stop in at the Cathedral of St. John the Baptist, the largest Catholic church in Georgia.

Boston, Massachusetts

Long famed for its Irish presence, Boston's population is estimated to be 21% Irish in origin. The parade day is full of enthusiastic revelers on the streets for one of the largest parades in the country. Also located in Boston are an abundance of historical Catholic churches. Find yourself inspired by the intense architecture of the Basilica and Shrine of Our Lady of Perpetual Help, or find a quiet respite in the Cathedral of the Holy Cross.

Chicago, Illinois

Chicago's parade rivals New Yorks, drawing in up to 2 million people. While the green river is always a sight to behold, there are a bunch of great Catholic spots as well. Assumption Catholic Church contains a relic of St. Peregrine for veneration; St. Hyacinth's Basilica has over 100 relics, including one from St. John Paul II; and the National Shrine and Basilica of Our Lady of Sorrows exhibits a full-sized replica of Michelangelo's "Pieta."

Philadelphia, Pennsylvania

Philly's St. Patrick's Day parade can trace its history to before the United States was established. There's an abundance to see in this historical city, but for Catholics we suggest stopping in at the 118-year-old Carmelite Monastery, where relics from St. Therese as well as her parents, Sts. Louis and Zelie Martin, can be venerated. Also in Philly is the Cathedral Basilica of St. Peter and Paul, where the tomb of St. Katharine Drexel is located.

San Francisco, California

San Francisco contains a large Irish-American population, thanks to the Gold Rush of 1849. Today it holds annually the largest St. Patrick's Day festival on the West Coast. While visiting the Golden Gate City, Catholics won't want to miss a chance to visit the National Shrine of St. Francis, where relics of St. Francis, St. Clare, and St. Anthony of Padua -- along with many glorious works of art -- will make for a full day of exploration.

St. Louis, Missouri

St. Louis has a rocking St. Paddy's Day party that draws a quarter million guests annually. The city is also full of Catholic sites like St. Mary of Victories Catholic Church, a Hungarian parish that has hundreds of relics and Catholic artifacts, including several that are reportedly from Christ's Passion. St. Louis is also home to the Shrine of Saint Joseph, where two separate miracles were confirmed to have taken place.

St. Augustine, Florida

St. Augustine has been revealed to be the city of origin for St. Patrick's Day parades, which go all the way back to 1600, when Spanish settlers began the custom. While in the historic Oldest City in America, be sure to visit Our Lady of La Leche National Shrine, one of the most famous pilgrimage spots in the U.S. The scenic grounds and beautiful chapel can make for a full day of exploration and reflection.