Celtic architecture refers to the building styles and structures created by the ancient Celts, primarily in regions like Ireland, Scotland, and Wales. This architecture is characterized by its use of local materials, such as stone and wood, and often features circular or oval shapes. Notable structures include ring forts, duns, and crannogs, which served as homes and defensive sites. In addition to residential buildings, Celtic architecture includes impressive monuments like stone circles and standing stones, which often held religious or ceremonial significance. The intricate designs and carvings found in these structures reflect the rich cultural heritage and artistic skills of the Celtic people.