| Name | Name:Bent Pyramid | Name:Arecibo Telescope | 
| Height | Height:101 m, (332 ft) | Height:150 m, (492 ft) | 
| Location | Location:Egypt | Location:Arecibo, United States | 
| Year Constructed | Year Constructed:c. 2605 BC | Year Constructed:1963 | 
| Description | Description:Angle of slope decrease during construction to avoid collapse. It was the tallest freestanding structure on land from c. 2605 BC to c. 2600 BC | Description:A very tall Telescope . In 2013 it was the tallest Telescope in the world. | 
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