Mental Floss

NATIONAL PARKS























Cannons used in the Civil War are on display at Fort Sumter.

The 1861 Battle of Fort Sumter sparked the American Civil War. From the garrison's 19th-century beginnings to its current use as a National Historical Park, here are 10 fascinating facts about Fort Sumter.

Mark Mancini


BigshotD3/iStock via Getty Images

Old Faithful isn't as predictable as it used to be, but geologists in Yellowstone National Park can still time its eruptions pretty accurately.

Mark Mancini