Oldest Buildings in Chronological Order

Ziggurat of Ur, Iraq (built in the 21st century BC, the height of approximately 64 meters or 210 feet)

Great Pyramid of Giza, Egypt (completed in 2560 BC, height of approximately 146 meters or 481 feet)

Temple of Artemis, Turkey (completed in the 6th century BC, the height of approximately 18 meters or 60 feet)

Pharos of Alexandria, Egypt (completed in the 3rd century BC, the height of approximately 115 meters or 380 feet)

Colossus of Rhodes, Greece (completed in 280 BC, height of approximately 33 meters or 110 feet)

The Hanging Gardens of Babylon, Iraq (built in the 8th or 7th century BC, estimated height of up to 75 feet)

Lighthouse of Alexandria, Egypt (completed in 280 BC, height of approximately 120 to 137 meters or 393 to 449 feet)

Axum Stelae, Ethiopia (erected during the 4th century AD, height of approximately 33 meters or 110 feet)

Note that the heights of some of these structures are estimated, and may vary based on different sources and measurements.