Shrine of the Grotto of the Redemption
Iowa
Father Paul Dobberstein reportedly began the project as a promise to the Virgin Mary after recovering from serious illness in seminary — the grotto is a decades-long thank-you built stone by stone over 42 years.
Why Roamward picked it
One priest hand-built nine interlocking grottos from minerals, fossils, and gems over 42 years (1912-1954), now valued over $4.3 million — the single strangest, most singular roadside attraction in the state, a genuine hidden-gem detour off I-35.
Hours, admission, and access change — confirm with the official source before you plan the detour.
Build a trip around hidden gems like this.
Roamward turns spots like this into a real road trip on your phone — the scenic drive, the stops, and the detours, planned around the vibe you’re after. Get early access: