What is really interesting about the Bosnian "pyramids" is that Semir Osmanagić, the man who "discovered" and popularised them, is a businessman who has made a great deal of money from using them to promote tourism in the region. Also interesting is that those which have not been investigated by "archaeological" teams funded by Osmanagić bear the hallmarks of a fairly typical flatiron hill, while those examples which most resemble step pyramids have been extensively excavated by his teams, which have an unusually high reliance on heavy earth-moving equipment of the type used to construct railway cuttings and other features which dramatically alter the landscape.

Gunang Padang is - just possibly - worthy of investigation by a more academically reliable organisation than those which have studied it so far. There is much evidence that the oldest structures, said by some to be man-made, are in fact a natural volcanic feature; nevertheless, the claim that the lower level was built by humans may deserve proper refutation and there is undoubtedly more than enough archaeology from later periods at the site to be worthy of a large-scale investigation.

(I don't know enough about the other two sites, so can't comment on them.)

Yup that was interesting who knows whats still out there waiting to be discovered/recognised