Unique Building

Riddle: What kind of building, tall and strong, is never used by the community that builds it?

Answer: A lighthouse. It's sole use it to warn ships, not to help the town that built it.

Source: https://www.riddles.com/11113

What kind of building, tall and strong, is never used by the community that builds it? — Unique building by Bonnie Canizaro v1.

Riddle: What kind of building, tall and strong, is never used by the community that builds it? Answer: A lighthouse. It's sole use it to warn ships, not to help the town that built it. — by Bonnie Canizaro v2.