The world’s longest, tallest and most expensive suspension bridge was completed on this date in 1998. The Akashi Kaikyo Bridge has a main span of 1,991 meters, or 6,532 feet. (The main span of the Golden Gate Bridge is 1,280 meters.) Akashi Kaikyo’s two towers are 283 meters high (928 feet). The bridge cost about $4.3 billion.