Christian basilicas are large, important church buildings that originated in the early Christian period. They typically feature a rectangular layout, a central nave, and side aisles, often with a raised platform called an altar at one end. The design allows for accommodating large congregations and often includes decorative elements like mosaics and frescoes. These structures were inspired by Roman public buildings and became central to Christian worship. Many famous basilicas, such as St. Peter's Basilica in Vatican City, serve as significant religious and cultural landmarks. Over time, basilicas have evolved in style and function, reflecting the diverse traditions within Christianity.