Oregon Caves National Monument celebrated its 99th birthday July 12. The park’s marble cave has suffered significant physical damage and secondary effects since its discovery in 1874. Resource managers are using a survey method called Visitor Impact Mapping to better understand where and how visitors have affected the condition of the cave.

What do you get with 54 tons of concrete, 3,500 stainless steel bolts, and 35,000 pounds of structural steel? A new way to head toward the surface at Mammoth Cave National Park.

Coronado National Memorial, which celebrated its 56th birthday on July 9, is situated on the Mexican border about 20 miles south of Sierra Vista. Coronado has two “sister parks” in Mexico. Hands-across-the-border partnerships like these produce many kinds of benefits.

Not only shouldn't you pose next to bison in Yellowstone National Park, but if you're visiting Saguaro National Park don't try to make friends with poisonous gila monsters. That lesson was painfully delivered to a 24-year-old man.