I just find this one really nifty.  An auditorium/stadium/community centre made pretty much entirely out of bamboo and a thatched roof.  And it’s gorgeous.  Arches upon arches upon truss-like-arches, going back as far as the eye can see.  Openings in the roof plane like an unfolding lotus flower casts light inward, highlighting the evocative structure even as it provides illumination.  Walls, balconies, stage, also all made of bamboo, held together by woven ropes.

Lovely.  Locally sourced, naturally harvested, nothing but borax salt for treatment, full of natural light and ventilation, and a delight to experience both inside and out.  Great stuff.