| Name | Name:Torre de Cristal | Name:Bent Pyramid | 
| Height | Height:249 m, (817 ft) | Height:101 m, (332 ft) | 
| Location | Location:Madrid, Spain | Location:Egypt | 
| Year Constructed | Year Constructed:2008 | Year Constructed:c. 2605 BC | 
| Description | 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 | 
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