The Rainbow Bridge at Niagara Falls works, but any bridge with the sun behind you will do.

Yes, but it depends on the location. If you’re asking about Niagara Falls (and that’s the most common scenario), the Rainbow Bridge is famous for a reason — afternoon sun hits the mist from behind you, creating that classic rainbow. But the key isn’t the bridge itself; it’s the sun angle. You want the sun at your back and the mist in front. At Niagara, the American and Bridal Veil Falls face roughly west, so later in the day the light lines up perfectly from the Rainbow Bridge. At Table Rock or the Skylon Tower you’ll also get rainbows, just from different angles.

If you’re somewhere else — a waterfall in a