Islamic architecture is characterized by several key elements. Mosques, tombs, and palaces are the three major building types. Mosques feature a central courtyard and are oriented towards Mecca. Geometric forms, arches, domes, and ornate decorations are commonly used. Interior space is highly valued over exterior appearance. The dome symbolizes power and can serve both religious and secular functions by covering important interior spaces. Overall, Islamic architecture is focused on the enclosed interior space and uses architectural elements to serve religious functions and express Islamic culture.