A steady stream of tourists come to Yakushima Island each year to gaze up in awe at Japan's most famous tree. The Jomonsugi cedar exceeds 16 meters in circumference and is thought to be more than 2,000 years old. Is it the country's largest? And what lies up in the treetops hidden from view? The Darwin crew joined a special research team traversing the dense undergrowth in their four-year quest to locate other massive cedars and document the incredible ecosystem thriving in the tallest branches.

Next time you pass by a mushroom, consider this: underneath that cap and stalk lies a network of thread-like filaments that could spread out up to a radius of one kilometer! Welcome to the "Marvelous Mystery Tour!" There are between 5,000 and 10,000 species of mushroom just in Japan. Yet only about 3,000 have names. And they come in all shapes, sizes, colors ... and odors! Mushrooms are without a doubt integral to forest ecology. Join us as we enter a whole new world just by lowering our gaze!