Niagara Falls` reputations as a natural world wonder and honeymoon capital of the planet beckons visitors from around the globe. But it is the bridges that actually bring most of them here. No other single factor contributes more to tourism growth - indeed the export trade economy overall - than the NFBC`s three monumental linkages of concrete and steel. Niagara Falls crossings rank second only to Kennedy International as the busiest port of entry between the U.S. and Canada. If you are about to travel over Niagara`s gorge, your vehicle will take one of about 7.2 million passages expected this year on NFBC bridges.