Secret passageways, trap doors and hidden rooms were standard in some of your favorite mystery series – like "Scooby-Doo" or Nancy Drew. You probably saw them coming. But in real-life, you'd never ...

There’s a secret back door to Muir Woods National Monument that most visitors don’t know about — and it’s guaranteed to delight hikers who discover it. If you park high above the 554-acre preserve on ...