Cobblestones are made from highly durable stones, usually granite or basalt. They were usually dug from nearby areas and then cobbled, or roughly shaped into the size needed. The cobblestones were then set in sand or mortar. Sand allows the road to gently give to traffic, preventing the cracking associated with pavement or asphalt. Streets paved with cobblestones have proven their durability and longevity by showing up through worn out sections of paved roads throughout the world.