The Venado Caverns are safe and easily accessible so that just about anyone can enjoy touring them. During the 1.5-hour tour, travel through narrow passages that give way to larger chambers that house marine fossils, bats, spiders, and crickets. • Explore the unique water currents, ecosystems and rock formations in Venado Caverns. • See different species like bats, spiders, crabs, insects and fish. • Walk and crawl through 4 caves that are extremely narrow.