Check out this circular wave generator at the Surf Lakes Wave Pool in Yeppoon, Queensland, Australia. It's straight out of Mad Max!
From Surfline:
Visually, the Surf Lakes concentric wave device is immediately striking ... Its rustic, creaking and noisy activations reminded this reporter of a wild theme park ride, complete with huffing, hissing and spluttering condensate explosions that served both to illustrate the immense pressures required to lift the 1400-ton “plunger” and the power and engineering feats that have occurred beyond the practical imagination of conceptualist and Surf Lakes Founder, Arron Trevis.