Unfinished building is Antoni Gaudí's Sagrada Família in Barcelona, a church that has been under construction since 1882, and that is now expected to be complete in 2026. There are numerous unfinished buildings that remain partially constructed in countries around the world, some of which can be used in their incomplete state but with others remaining as a mere shell. Some projects are intentionally left with an unfinished appearance, particularly the follies of the late 16th to 18th century. Some buildings are in a cycle of near-perpetual construction, with work lasting for decades or even centuries. Antoni Gaudí's Sagrada Família in Barcelona,
Biomimetic architecture elements as inspiration in design, originated possibly with the beginning of man-made environments and remains present today. The ancient Greeks and Romans incorporated natural motifs into design such as the tree-inspired columns. Late Antique and Byzantine arabesque tendrils are stylized versions of the acanthus plant. Varro’s Aviary at Casinum from 64 BC reconstructed a world in miniature. A pond surrounded a domed structure at one end that held a variety of birds. A stone colonnaded portico had intermediate columns of living trees. The Sagrada Família church by Antoni Gaudi begun in 1882 is a well-known example of using nature’s functional