Malta is a small island of just 122 square miles in the middle of the Mediterranean. When you approach the country’s capital from the harbor, you are struck by its multiple layers of stacked buildings. You also notice their uniform golden hue. That is Maltese limestone, the bedrock of the archipelago. There are two types. The most common is called Globerigina while the harder version, which is typically reserved for important construction, is named Coralline. Those arched doorways along the waterfront are part of the Barriera Wharf.