What was a characteristic feature of the Byzantine Era's architecture?

The characteristic feature of Byzantine architecture that stands out is the use of large domes and vaults. This architectural style often emphasized grand, expansive interiors, which were made possible by the development of the pendentive. The pendentive is a triangular space that allows a dome to be placed over a square room, which was a significant innovation in architecture.

Byzantine structures, such as the Hagia Sophia, are noted for their majestic domes that symbolize the heavens and create an awe-inspiring sense of space. The use of vaults further contributed to the structural integrity and grandeur of these buildings, allowing for extensive decorative mosaics and a luminous ambiance within worship spaces.

While asymmetrical design, bright colors, and a focus on naturalism played roles in different artistic expressions or periods, they do not define the core architectural achievements of the Byzantine Era in the same pivotal way as the emphasis on large domes and vaults does.