St. Peter's Chapel on Mare Island is a small 1901 wood-frame church with an extraordinary interior: 27 Tiffany stained glass windows, making it one of the most significant collections of Tiffany glass on the West Coast. The windows were donated over many years by naval families as memorials to officers who died in service.
The chapel operated as the working church for the Navy base for nearly a century. After the base closed in 1996, preservation efforts saved it from demolition. It is now open for tours and occasional events.
Access requires visiting Mare Island, which is reached by crossing the bridge from downtown Vallejo. The chapel is within the historic district at the southern end of the island. Guided tours are available on weekend afternoons; check the Mare Island Historic Park Foundation website for current schedules.