1) When were the bridge built?
2) Who was the engineer/arquitect/etc.
3) How long did it take to make the bridge?

1) The Boforo Bridge  was completed in 1973. The engineers were Sir. Gilbert Roberts and William Brown were in charge of this project. It was built in 3 years.

2) The Sydney Harbour bridge was completed in 1932. The engineers John were Bradfield, Ralph Freeman and Thomas S. Tait were in charge of this project. It lasted 8 years.

3) The Rialto Bridge was completed in 1591. The arquitect Antonio da Ponte is in charge on the project. It took 11 years do be built.