Before many thousand years (atleast 17000), when lord ram decided to attack Lanka (Current shreelanka) to defeat the evil ravan, the biggest problem was to crossover the sea which has a minimum distance of 32 kilometers at present.
As per the Epic, ramayan, Lord Ram constructed a bridge with help of his army. That bridge is known as Ram setu, setu samudram or Ram bridge. The bridge is now under the sea but not destryed fully. Here is the satelite map of the same.
I wish a bridge of humanity remains intact within heart of everone of us. I pray the same to Lord ram on his birthday today.