Actor Tate Donovan joins John Stevens in China, where they practice Tai Chi in the park, dine on fresh scorpion and study the magnificent Great Wall and the Terra Cotta Warriors. In Alaska, Joni Ravenna treks Mendenhall Glacier and John Stevens visits the Aleutian Islands, where fishing for salmon and halibut offers a study in ecology.

Get a thrilling bird's eye view of the Grand Canyon by high speed jet. Experience some "Jeep thrills" through the cactus filled landscape and take an up close look at the desert wildlife, tarantulas and rattle snakes. And, learn to fly, fuel free, on a sail plane with Joni Ravenna.

River rafting, wreck diving and oil wrestling are just some of the adventures in store for viewers who join actor Sean Astin in Turkey. While in Turkey, witness the mystical dance of the Whirling Dervishes and trek through the Antalya ruins of Perge, dated back to 800 B.C.

Lewis and Clark's path along the Missouri, dinosaur fossils, and ghost towns in Montana.

This episode of "Earth Trek" features an exciting elephant trek through the rainforests of Thailand. Viewers also experience scuba diving in Phuket and explore the ancient city of Ayutthea in search of what lies hidden beneath the ruins.

Joni Ravenna treks through India by elephant, camel and foot, in search of the sacred Rishi (Hindu sage). Guest Deepak Chopra illustrates the goals of enlightenment according to the ancient Indian Scriptures and sheds light on why "A Rishi sees not through the eyes of the flesh but through the eyes of the soul."