Civil engineering is one of the oldest engineering fields, focusing on infrastructure development like buildings, bridges, and water systems.
1. 
Irrigation Canals (~3000 BCE)- Purpose: Developed by ancient civilizations (e.g., Mesopotamians) for agricultural irrigation.
- Category: Water management.
2. 
Pyramids of Egypt (~2600 BCE)- Purpose: Monumental tombs, showcasing advanced knowledge of construction and material use.
- Category: Structural engineering.
3. 
Great Wall of China (~700 BCE)- Purpose: Defensive structure spanning thousands of kilometers.
- Category: Infrastructure.
4. 
Roman Aqueducts (~312 BCE)- Purpose: Advanced water supply systems to transport fresh water to cities.
- Category: Hydraulic engineering.
5. 
Pantheon Dome (~126 CE)- Purpose: The largest unreinforced concrete dome in the world, showcasing advancements in material engineering and structural design.
- Category: Structural engineering.
6. 
Pont du Gard (~19 BCE)- Purpose: A Roman aqueduct bridge in France, demonstrating early civil engineering skills.
- Category: Hydraulic and structural engineering.
7. 
Brooklyn Bridge (1883 CE)- Purpose: First steel-wire suspension bridge, a milestone in modern bridge engineering.
- Category: Structural and transportation engineering.
8. 
Hoover Dam (1936 CE)- Purpose: A major dam on the Colorado River, providing water and power to several states.
- Category: Hydraulic engineering.
9. 
Golden Gate Bridge (1937 CE)- Purpose: Iconic suspension bridge that remains one of the longest and tallest.
- Category: Structural and transportation engineering.
10. 
Burj Khalifa (2010 CE)- Purpose: Tallest man-made structure, pushing the limits of skyscraper engineering.
- Category: Structural engineering.