My friend J and I visited the subtropical Whangārei Quarry Gardens:

In 1944 Hardie Brothers established a stone quarry … Severe flooding in 1974 curtailed the operation and the … land lay fallow for 20 years, used mainly as a rubbish dump, full of abandoned vehicles, concrete slabs, gorse, pampas grass, and other weeds. … In 1997 [a] group of enthusiasts … began clearing the overgrown site.

Quarry gardens pathway.
Small waterfall.
Big waterfall.
Lake fed by big waterfall with steep rocky sides.
Eel in the lake.