Approach the Washington-Oregon border on Route 3, and you'll stumble into a steep series of zigzags, called the Rattlesnake Grade, that connects Flora, Oregon to Anatone, Washington. If you can imagine a Western version of the Alps' switchbacks, this is it, a ragged sequence of turns that attracts thrill-seeking motorcyclists and cyclists eager to push the limits of their machines. Not for the faint of heart, this stretch earns an extra layer of drama for its distinct lack of services. Tread lightly over its intermittently graveled surface, and avoid getting a flat tire at all costs.