180 gram vinyl. 
Remastered by Jimmy Page. 

The first of Led Zeppelin's records to have its own name, rather than a numeral and a speaks-for-itself attitude, 'Houses of the Holy' saw the band growing and, yes, maturing -- it was also their first record to comprise of entirely original material, and the band's textures opened up where their early reverence for their influences had started to fade away.