07/26/2013 01:01 am ET Updated Sep 24, 2013

Descending the Anhumas Abyss

A perfect day in the life of an adventure traveler is one that gets your adrenaline pumping, energizes the soul, and enhances your appreciation for the natural world. Brazil is a paradise for the spirited adventurer in so many diverse ways, but one little known gem lies hidden beneath the Earth's surface just outside the up and coming town of Bonito, the Abismo Anhumas (Anhumas Abyss).

Each day 18 individuals are allowed access to this wonder of nature through a small gap in the top of the Anhumas chamber. A 24 story rappel brings you to a floating boardwalk above a crystal clear underground lake, from where your journey continues underwater.

This 3 Minute Postcard shows you exactly what to expect when you enter this unique and amazing world. It honestly took my breath away, and of all the adventures I've been lucky enough to have in my life, this one ranks in a class all on its own.