Ticked off boating alongside Niagara Falls, seeing New York from atop the Empire State Building and tasting wine in California's Napa Valley? Somehow, no matter how many times you visit the States and how many experiences you cram in, there's always more to discover. From 'secret' natural wonders to fun family attractions off the beaten path, these are some of the USA's best underrated experiences.

Click through the gallery for the ultimate guide to America's lesser-known attractions and destinations...