On the rugged coast of Nova Scotia, waves crash, gulls cry, and fog rolls in thick off the Atlantic. It’s easy to imagine that nothing has changed here in centuries—and at the Fortress of Louisbourg, it truly hasn’t.

There it stands—massive, stoic, and shrouded in mystery. On the rolling Salisbury Plain in southern England, Stonehenge rises like an ancient riddle etched into stone. It’s one of the most iconic monuments in the world, yet no one can fully explain why it was built, who exactly built it, or how those massive stones got there.