Some photos of a MONSTER sized, Japaneze stone chambers

(Is this a wedge or passage tomb?)

Ishibutai crypt is, in overall size, the largest in Japan. The largest of its boulders, the one forming the southern part of the ceiling, is estimated to weigh 75 tons!!!.

2 photos in black and white and some neat diagrams

A similar tomb at a site called Jourugami was recently found to contain a stone coffin see
japantoday.com/e/?content=news&cat=1&id=206258
for more on that one.