Hundreds—even thousands—of years ago, Native American peoples built complex and mysterious earthworks. Here are 11 you can visit for a glimpse into prehistory.

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All five answers to the questions below have something in common. Can you figure it out?
Need new kicks for Halloween? Reebok has you covered.
Historians link trick-or-treating to a few different ancestors, some old and some new.
The footage is from a new ‘Endurance’ documentary hitting Disney+ later this year.
The ’90s catchphrase was made famous by ‘Seinfeld,’ but Jerry and company didn’t coin it.
Step aside, John and Mary—make way for Liam and Kaitlyn.
Sorry to tell you, but killers really have crawled out of medicine cabinets to attack their victims.
Science reinforces that it’s never too late to stop smoking.
Can you figure out what the two missing letters are and type in the correct word?
Roborock has teamed up with Mental Floss to explain why space is a vacuum—all while pushing the boundaries of smart cleaning technology back on Earth.
These strange, spooky cemetery tales of vampires, ghosts, and bloody headstones will keep you up at night.