Yellowstone National Park's nearly 3,500 square miles seep slightly across state borders into Montana and Idaho, but its major attractions are contained in the northwest corner of Wyoming.

The best way to get around Yellowstone National Park is by car ... so you'll want to use an official Yellowstone map (available online or at the park's five visitor centers) or specific GPS ...

A recent study discovered the exact location of the Yellowstone supervolcano's magma cap -- and hints at when it may erupt.