Kosi toranj (Torre pendente di Pisa) je zvonik katedrale Duomo di Santa Maria Assunta. Temelji i jedan dio tornja izgrađeni su 1171., a objekat je završen 1372. godine. Nakon izgradnje toranj je počeo da se krivi, a potpuna rekontrukcija i zaustavljane krivljenja objekta završeno je 2001. godine. Smatra se da je projekat uradio Diotisalvi.
The Leaning Tower (Torre pendente di Pisa) is a bell tower of the Cathedral Duomo di Santa Maria Assunta. Its fundaments and a part of the tower were built in 1171, and the building was completed in 1372. After it was built, the tower started tilting. Its full reconstruction and stabilization was completed in 2001. It is believed the original architect was Diotisalvi.
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