Subway tiles have been popular since the early 1900s when used in New York subway stations. They are still widely used today and have evolved from ceramic to glass, which allows for richer colors. Glass subway tiles are impervious to water, making them ideal for bathrooms, kitchens, and pools. They are often used as kitchen backsplashes to add beauty and protect walls from water damage. Vivid glass subway tile colors have become popular for transforming interiors inexpensively.