Season 1, Episode 3

Predjama: Hidden Caves of Slovenia

Air Date: 2017-09-15

Overview: Predjama Castle is carved into the heart of a Slovenian mountain and nestled among stunning natural attractions, including the eerie Postojna Caves and Lake Cerknica--Europe's largest intermittent lake. Brown bears, aquatic salamanders known as olms, and more thrive in the shadow of this imposing fortress.

Runtime: 50 minutes