The city was filled with magnificent monuments, many of which still stand today.

stand 是动词，意思是"站立、矗立"，在这里用现在时表示这些纪念碑至今仍然保持直立的状态。stand 可以指建筑物、雕像等高大物体的直立状态，强调其持久性和稳固性。