World's largest bridge to connect Italy and Sicily

1. The Strait of Gibraltar

Taking their name from the famous Berber Muslim General Tariq ibn-Ziyad who conquered Spain in 711, the Straits of Gibraltar stand between Europe and Africa, and the Mediterranean meets the Atlantic. The Gibraltar Bridge would offer immense benefits to both Morocco and Spain, though the format of the bridge and its funding are still far from finalised though it appears that the choice of a bridge over a tunnel has been made . There’s an excellent essay on the proposed bridge from Francisco Ferrer here and a radical proposal for a floating bridge by architect Eugene Tsui here.

2. The Dardanelles

At the point where Europe meets Asia Minor, the Dardanelles is the 61-km-long (38-mi) strait between the Aegean Sea and the Marmara Sea. The westernmost section of the waterway divides Europe from Asia and connects the Mediterranean and Black Seas.

3. Sunda Strait, Indonesia

A feasibility study for the construction of a bridge linking the main Indonesian islands of Java and Sumatra was commissioned in the mid-nineties but never released. Sumatra and Java are separated by Sunda Strait which is about 25 km wide and its narrowest point and has the added difficulty of running very close to a famous volcanic island named Krakatoa which exploded famously in 1883 and does so quite regularly every few hundred/thousand years. At one point a 60-kilometre bridge was under discussion but more recently the possibility of the bridge being built is waning given that the Nusantara Project to build a rail tunnel between the islands is gathering momentum.