Into the Narni’s underground, in the Lacus, an ancient environment of over 800 years ago, you will find an exciting path with which you can discover the fun aspect of speleology, but also its importance in researching new water sources. You can conclude the tour of Narni’s underground with a special experience! The Lacus is an underground environment of the 1200 with stone vault and some remains of a floor in opus spicatum (spiked work). Inside this big and suggestive place it has been set up an indoor adventure trail really unique: NarniAdventures.  Here you’ll compare yourself, in complete safety, with rope bridges, cable car, climbing wall. But as well as the adventure excitement, you’ll discover the importance of the water through many reproductions, photos, educational panels, a waterfall and the possibility to walk the upper passage in an environment with the typical features of a cave. The main goal is that of introducing the speleology as entertainment and adventure, and in its feature of researching new important water supply sources.