Tower of Pisa stands at 60 metres and until 1990 was leaning at about a 10 degree angle.
Although it was designed to be perfectly vertical, it started to lean during construction.
Construction Resumes
The Leaning Tower of Pisa at Night
The Tower at Night
After the 100 year hiatus, Giovanni di Simone stepped forward in 1272 and began to add four more floors to the tower. He actually managed to cause the tower to lean over more when he tried to compensate for the original lean by making one side of the upper floors taller than the other.
In 1284 construction was halted again, this time because of the Battle of Meloria, in which the Pisans were defeated by the Genoans.
In 1319 the 7th floor was finished. The bell-chamber was added in 1372, and then the tower was