SS Peter & Paul Catholic Church was built in 1905 in the unincorporated village of Petersburg. The parish was established in the 1860s by the German-speaking population of rural Delaware and Dubuque Counties. The Gothic Revival church has a multitude of pointed arch window openings, many with stained glass windows from Germany. The ceilings and walls are decorated with murals.

By 2017, the parish decided that it was time for an extensive restoration of the church due to basement flooding, excessive humidity, and antiquated HVAC and electrical systems. The parish raised over $2.5 million from private donations and applied for a State Historic Tax Credit.

Exterior work included a new steel roof, repair and repointing of masonry, restoration of all windows, and installation of storm windows to protect the stained glass. Inside, new electrical and HVAC systems were installed. The elaborate altars and furnishings were completely restored. The over 100 statues were also repaired and restored.

On the main floor, all of the plaster walls were repaired and repainted. A nationally renowned historic decorative paint conservator was retained to investigate the historic interior painting scheme. He uncovered the original design of stencils and other decorative paintings. With that evidence, some historic stencils and paintings were replicated to match the original interior design. An art conservator was hired to conserve the murals.

The project is an important example of how a small congregation in a very rural community was able to plan a first-class restoration and raise the funding to complete the restoration. The church is a landmark in the community, so it is important to this small community that it continue to be well-maintained and regularly used.