[Ripliancum]

Michigan used to have roughly ten thousand mounds from the Hopewell and Adena cultures. Most have been destroyed through farming and such.

Who know’s what’s underground up there.

[American Constitutionalist]

If they start to see the ground glowing and lava starts to shoot out, then, it's a under ground volcano.

[Squawk 8888]

Are you referring to the Indian burial mounds? We have quite a few here. I was surprised to learn a few years ago that my favourite toboganning hill from my childhood was actually a burial mound.