"Jules Verne's pioneering classic tells the story of the distinguished but eccentric Professor Lidenbrock, who finds a scrap of parchment in an old manuscript. A cipher, written in runes, tells of an entrance to another world - a world hidden beneath our own. So with his nephew reluctantly in tow, the Professor follows this cryptic clue down into a dormant volcano, and the further they descend, the more extraordinary the discoveries and creatures...

When Captain Shang is mortally wounded by Shan Yu in battle, Mulan must travel to the Underworld, Diyu, in order to save him from certain death. But King Yama, the ruler of Diyu, is not willing to give Shang up easily.

"Greek and Roman demigods from the Prophecy of Seven must work together to seal the Doors of Death--and help Percy and Annabeth escape the Underworld in the process"--

"In this groundbreaking masterpiece of ingenuity and intrigue that spans 50,000 years of human history, New York Times bestselling author James Rollins takes us to mankind's next great leap. But will it mark a new chapter in our development. or our extinction? A war is coming, a battle that will stretch from the prehistoric forests of the ancient past to the cutting-edge research labs of today. In the remote mountains of Croatia, an archaeologist...

"Pat and Jen do everything together, including saving the day! But when Jen and Evil Jen find out they have one chance to find their long-lost mother in the Overworld, Jen's going to take it--even if it means that Pat can't join her on an adventure for the first time ever. With Mr. Rainbow's help, traveling to the Overworld should be the easiest part, but when something goes wrong, Jen and Evil Jen wind up trapped in the Nether. Right about now would...

Making their way beneath the Antarctic ice toward the center of the world, a team of specialists traverses rocks, caverns, and underground rivers in darkness, not knowing the incredible wonders--and terrors beyond imagination--that lie ahead.

Rescuing Dana from the underworld after making a dangerous pact with Hades, Owen, John, and Sydney tackle mythological Cyclopes who have taken over the power plant in Owen's hometown with the intention of building a monster army.