I've heard people talk about cultural significance. What does this mean?

According to the National Heritage Resources Act, cultural significance means aesthetic, architectural, historical, scientific, social, spiritual, linguistic or technological value or significance.

Section 3 (3) of the Act lists several reasons why a place or object could have cultural significance:

(a) its importance in the community, or pattern of South Africa’s history;
(b) its possession of uncommon, rare or endangered aspects of South Africa’s natural or cultural heritage;
(c) its potential to yield information that will contribute to an understanding of South Africa’s natural or cultural heritage;
(d) its importance in demonstrating the principal characteristics of a particular class of South Africa’s natural or cultural places or objects;
(e) its importance in exhibiting particular aesthetic characteristics valued by a community or cultural group;
(f) its importance in demonstrating a high degree of creative or technical achievement at a particular period;
(g) its strong or special association with a particular community or cultural group for social, cultural or spiritual reasons;
(h) its strong or special association with the life or work of a person, group or organisation of importance in the history of South Africa; and
(i) sites of significance relating to the history of slavery in South Africa.