Golden Gate Bridge, San Francisco

An engineering masterpiece, this bridge, built in 1937, towers with sturdy grace over the Golden Gate. Stretching over 4,200 feet, it is every bit as awesome an accomplishment in suspension-bridge engineering today as it was over half a century ago. Pedestrians and bike riders can access the east entrance for a jaunt on one of the world's most famous corridors. For photos, or to view the bridge in its entirety, try the spectacular lookout points located at the southeast and northeast ends. Don't miss the historic Roundhouse, a gift shop and visitors center, which boasts a fine selection of souvenirs, and an informative exhibit about the bridge's construction and history.