Dozens of intriguing wooden posts jut out of the aquamarine water by the historic CN Rail swing bridge in Atherley Narrows and in the distance alongside Shotgun Island. But they’re actually bridge footings and not the ancient Indigenous fish weirs that make this Ontario spot a national historic site. Those are buried in protective layers of silt here in the shallow waters where Lake Couchiching and Lake Simcoe meet. Standing on an old steel trestle structure from the railway era that overlooks the channel, I wish I could have visited either 5,000 years ago or a few years from now if an ambitious rethink of the area succeeds.

The National Underground Railroad Network To Freedom Program has expanded with the addition of 16 sites, including one at Cumberland Island National Seashore in Georgia and another at Gulf Islands National Seashore in Florida.

Parks Canada is conducting a prescribed fire in the southwest corner of Prince Albert National Park in Saskatchewan.

This national parks quiz and trivia piece is all about several April notables. Just how much do you know about Isle Royale and Voyageurs national parks, and John Muir and Ulysses S. Grant? Test your knowledge to find out, and maybe learn a little something new, too.