Mount McKinley is the highest peak in North America.

This week’s national park quiz will find out how much you know about climbing in the national parks. Answers are at the end. If we catch you peeking, we’ll make you write on the whiteboard 100 times: “Placing protection without due regard for security has been the last mortal act of many a weekend climber.”

Denali National Park and Preserve is home to the highest mountain in North America, a distinction that inevitably attracts mountaineers and sightseers from all over the world. Now a new twist in possible activities at Denali is under discussion: sky diving.

Completion of the Parks Highway in 1971 quite literally paved the way to Mount McKinley National Park, tripling its visitation within two years. The park now named Denali celebrates its 92nd birthday today, and the Parks Highway remains its only automobile-friendly link to the world.

The recent winter weather may have you thinking more about travel to Florida or Arizona instead of Alaska, but if you're considering a trip to Denali National Park next summer, it's not too soon to make reservations for the park bus system or campgrounds.

This week’s quiz is about surviving – or even better, avoiding – dangerous situations in national parks. Answers are at the end. This is serious stuff, so you’re welcome to peek all you like.

Tuesday’s efforts to locate two missing backpackers in Denali National Park were fruitless, despite the best efforts of eleven ground teams and four aircraft crews. Today’s operation will more thoroughly search high priority areas and send ground teams into higher terrain. Five new teams will help out.

Hikers Abby Flantz and Erica Nelson remain missing since failing to return last Friday from an overnight backpacking trip in Denali National Park & Preserve. Rescuers continue to search a 100-square mile area of the Savage River drainage.

Searchers in Denali National Park have been unable to locate two female backpackers missing since Friday when they didn't return from a scheduled overnight trip in the park. Officials have intensified ground and aerial search efforts in a 100-square mile area of rugged, trailless terrain.