The Mercado de San Miguel in Madrid is a stunning example of early 20th-century cast-iron architecture. Located near Plaza Mayor, the current structure was completed in 1916. While it originally served as a traditional wholesale food market, it was renovated and reopened in 2009 as Madrid's first 'gourmet market.' The building is characterized by its large glass windows and ornate iron pillars, which allowed for a light, airy interior that was revolutionary for food hygiene at the time. Today, it serves as a culinary landmark where visitors can sample high-quality Spanish delicacies, from Iberico ham to fresh Mediterranean seafood. It stands as a prime example of 'adaptive reuse,' where a historic industrial building is preserved by transitioning into a high-end social and gastronomic destination.