widow's walk
noun
- N. Amer. a railed or balustraded platform built on a roof, originally in early New England houses, typically for providing an unimpeded view of the sea〈北美〉（尤指早期新英格兰海边房子屋顶上的）眺望台。
词源
1930s: with reference to its use as a viewpoint for the hoped-for return of a seafaring husband.