Grand Gulf State Park (West Plains, MO)

The result of a collapsed cave system, Grand Gulf is often known as "Missouri's Little Grand Canyon."   The massive collapse  provides a great cave cross-section that couldn't be a better outdoor classroom.  The canyon, or gulf (shown), a natural bridge (where the photo is taken from), and a cave all give insight on this ancient cave system and its demise.

This view, from the observation platform, shows two of the former cave passages that, all told, stretch for nearly a mile at close to 130 feet high.

At times parts of the gulf floor hold water, but we were there in early September--the driest time in the part of the country.  This also means the undergrowth was thick, having grown all summer.