Is this subject to survivorship bias? Will future generations wonder at the inexplicable durability of a few modern structures still available to wonder at, for accidental reasons?
With regards to the featured article, I'd say multiple factors are at play - Roman concrete has amazing properties and structures that used it combined with good quality-control (i.e. correct material ratios in the concrete) and good engineering survived.
The human elements, quality-control and design, are less interesting than a magical substance.