This full-day trip from Batumi ventures inland to two of western Georgia’s natural wonders. At the Martvili Canyon, visitors glide by boat between mossy limestone walls and emerald pools fed by waterfalls, once a bathing spot for Georgian royalty. The tour continues to the vast Prometheus Cave, following lit walkways past dramatic stalactites, underground rivers and chambers. With comfortable transport and a guide, it combines striking scenery and geology on an easy and rewarding excursion from the coast.