Located just down the street from the Royal Palace in the heart of Monaco is St. Nicholas Cathedral. The church is where the wedding of Princess Grace and Prince Rainier was held in 1956. It's also the resting place of members of the royal family including the much-visited tomb of eternally popular princess and actress Grace Kelly. Dedicated to St. Nicholas the cathedral holds mass on his saint's day of December 6th when young children gather to celebrate his life.