You can visit any of these shrines as a tourist. You'll see beautiful architecture, learn American Catholic history, and maybe pick up a medal or a prayer card. That's not nothing.
But a pilgrimage is something more. It's going to a holy place on purpose — with a prayer in your heart, a petition you've been carrying, a gratitude you want to express, or simply the desire to be somewhere that has been saturated with the faith of those who came before you.
The shrines in this section were built by people who believed. They carried their faith here from Ireland and Italy, from Poland and Mexico, from Germany and the Philippines. They prayed on this ground, suffered on it, and died near it. When you visit, you join a long chain of pilgrims stretching back through American Catholic history.
Go with intention. Come back changed.