The entrance to the Blue Grotto awaits

Lavacicles are a common volcanic feature in the caves

Cool, moist winter air moving through frozen caves grows rare curved ice crystals

Cave coral or cave popcorn is a slow-growing mineral deposit.

Many caves have been developed with the addition of trails, ladders or stairs

Closed for part of the year, Crystal Ice Cave is a unique and delicate cave

In winter, dripping water freezes into beautiful domes on cave floors