Smoke from a wildfire in Big Cypress National Preserve has prompted closure of a major interstate highway connecting the east and west coasts of Florida. The shutdown of Interstate 75, also known as Alligator Alley, is into its fourth day, and may continue through the weekend.

There are some underground trails in Mammoth Cave National Park that are supposed to be rough and rugged. The routes followed for the popular "wild cave" tours, for instance. But most of the other trails should be relatively easy on visitors, and park officials say it's time to do some rehab work.

It's been a rather cold, wet winter in much of the country, and Olympic National Park includes a smorgasbord of outdoor delights to help cure a case of cabin fever. Here's some important travel information for anyone planning a visit to Olympic in the next two months-and a tip than can save you some money on your trip.

Crews at Stones River National Battlefield in Tennessee slowly but steadily are putting the battlefield back in order in the wake of a tornado that registered a 4 on the Enhanced Fujita Scale.