Construction began in 1856, paused for the Reform War, the French Intervention, and the Mexican Revolution, and only really concluded in 1937 — which is why the cathedral's exterior reads neo-Gothic in places and neo-Classical in others. The yellow stone facade and twin towers are the visual anchor of the old town, visible from the seafront and most of the streets that run up from it.
The interior is more interesting than the outside suggests: a triple nave, a star-vaulted ceiling, and one of the few church organs in northwest Mexico still in regular use. Look for the Star of David panels above the altar — locally explained as a gesture of thanks to Jewish merchants who helped fund the cathedral's completion.