Architectural achievements refer to significant structures or designs that showcase innovation, creativity, and engineering prowess. Examples include the Eiffel Tower, a symbol of Paris, which demonstrates the use of iron in construction, and the Great Wall of China, an ancient marvel that reflects the historical significance of defensive architecture. These accomplishments often influence modern architecture and urban planning. The Sydney Opera House is renowned for its unique shell-like design, while skyscrapers like the Burj Khalifa in Dubai represent advancements in height and structural integrity. Together, these achievements highlight the evolution of architectural styles and techniques throughout history.