The landing strip theory has always struck me as the laziest possible explanation. "We can't figure out how primitive people made something impressive, so aliens did it." Right.
That said I do think the hydraulic/water calendar theories are a bit more convincing but still leave massive gaps. Nobody actually knows and anyone who tells you they do is selling something.
What I want to know is whether theres been any decent ground-level investigation of the lines themselves in the last decade or so. Most of what I read online is the same recycled Erich von Daniken stuff from the 70s dressed up with better graphics. Has anything genuinely new come out of the Peruvian researchers who've been working the site? I know there was some drone survey work done a few years back that apparently identified new figures.
Anyone here actually been out there? I've done enough trudging round supposedly significant sites in Suffolk to know that being physically present changes your perspective on these things completely. Curious what others reckon.