Here at last they will discover the hideous secret of all life on Earth...but can they escape these uttermost vaults at the bottom of the world, and keep sanity enough to warn mankind...?

At the Mountains of Madness is a journey into the core of Lovecraft's mythos--the deep caverns and even deeper time of the inhospitable continent where the secret history of our planet is preserved--amidst the ruins of its first civilization, built by the alien Elder Things with the help of their bioengineered monstrosities, the shoggoths.

Since it was first published in Astounding Stories during the classic pulp era, At the Mountains of Madness has influenced both horror and science fiction worldwide!