Hong Kong has many of such sites. I remember when I was 7-ish years old, my father took me to an island to look for the grave of my great grandfather, who fled to HK during China's civil war. We trotted the mountains thru the tall hillside grass to reach clusters of abandoned graves, and checked the tombstones for the man's name.

We more or less hiked (no trails) till sunset, when I suggested we should turn back before dark. The island was more or less deserted except for a newly built public housing estate at a pier. Being stuck on a (almost) wilderness mountain surrounded by abandoned tombs at night was not my idea of fun.