Looks like a military structure, it's situated among tangled vines behind a big cluster of boulders. Someone has done the clear up, it's now quite easy to access and have a full view of the facet.
Get Gwulo's books
Download free sample chapters, or buy the books:
Directory
Click on your area of interest to choose from over 30,000 pages about old Hong Kong:
Or choose a popular article:
User login
Navigate gallery
Random photo
1961 Doug Brentlinger's photos