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,
Union Park Congregational Church and Carpenter Chapel on the National Register of Historic Places. The church building is currently occupied by the First Baptist Congregational Church, whose official mailing address is 1613 W. Washington Blvd. in Chicago. The Gothic Revival chapel was designed by architect Otis Wheelock, partner of W. W. Boyington in the firm of Boyington & Wheelock, for the Chicago Theological Seminary, which was located on the same campus; the chapel was completed the same year that construction began on the church. The church, also in Gothic Revival, was designed by architect Gurdon P. Randall and was constructed between 1869 and 1871; it was added