in Cairo joins the island of Zamalek to Boulaq, or at least it did until 1998 when it was taken down, a new bridge and flyover having been built above it. It used to be rumoured that the original Boulaq Bridge was built by Monsieur Eiffel (of the Eiffel Tower fame) and that he committed suicide when it failed to open. However that was just a rumour. The Boulaq Bridge would have been 'celebrating' 100 years since it's opening in July this year. It's a shame it's no longer there.
Here's a link to a brilliant site, scroll right down to the last but one title to find Samir Raafat's article on the Boulaq Bridge.