a tall round tower in Pisa, Italy, which does not stand straight, but leans to one side. It was built in the 12th century and is popular with tourists. White marble campanile in Pisa, Italy, famous for the uneven settling of its foundation, which caused it to lean
{i} bell tower of Pisa Cathedral in Italy which leans to its side (the Tower started to tilt during its construction, which started in August 1173 and continued for about two hundred years -completed in 1350)
5 degrees (about 15 ft [4.5 m]) from the perpendicular. Begun in 1173 as the third and final structure of the city's cathedral complex, it was designed to stand 185 ft (56 m) high. Work was suspended several times as engineers sought solutions; the tower, still leaning, was completed in the 14th century. Subsiding at the rate of 0.03 in (1.2 mm) a year, the structure was in danger of collapse, and in 1990 it was closed as engineers undertook a strengthening project that decreased the lean by 17 in (44 cm) to about 13.5 ft (4.1 m). The work was completed in May 2001