I guard the coast but never march. I wear a spiral but have no shell. I flash my eye but cannot see. What am I?

I am a path that doesn't touch the ground. I stretch across the widest rivers and span the deepest valleys, yet I never move an inch.

A person using a credit card, a horse to ride to battle hard, or an object to transmit power to your device while sitting in your yard.

I stretch far and straight from town to town, with steel on wood where wheels roll down. I carry people, cargo, too, what am I that runs straight through?

I closed the lid on Pandora's box, I open the door to new things, You can even use me to find a date, If you're crazy you may be off the...