Buildings like the Parthenon and the Colosseum are so well-known and often studied in architecture because they represent important cultural and historical landmarks that have endured for centuries. They also showcase architectural design and engineering techniques that were innovative for their time, and have influenced countless buildings and structures that have been built in their wake. Furthermore, these buildings have become symbols of their respective cultures and civilizations, and their enduring popularity and historical significance make them important case studies for the study of architecture and design.