[RightWhale]

Looks like a highway.

[Liberal Classic]

Verging into science fiction here, the Ringworld is a half-way step before the construction of a Dyson sphere. Instead of a sphere, a ring is built which circles a star. The advantages are that it requires significantly less mass, it can spin to simulate artificial gravity, and spacecraft don't need to launch from the surface, they can be slingshotted off the rim. An interesting mental excercise, such as this article, but highly speculative.

[PatrickHenry]

Looks like a highway.

Yes. Larry Niven, the author of Ringworld, related some correspondence he had with an engineer who said that the dynamics of ringworld were, in essence, like a very long suspension bridge.