Private Postojna Cave Discovery and Predjama Castle

Ride an underground electric train, see the bright-white stalagmite aptly called Brilliant, and learn the legends of a clifftop castle in Slovenia. Your journey continues at the renowned Postojna Cave, where you will venture into the enigmatic depths of a labyrinthine system that stretches more than 12 miles through awe-inspiring underground galleries, passages, and halls that will leave you spellbound.

As you ride the underground train through cavernous chambers, witness the astounding natural sculptures, vibrant hues, diverse fauna, massive stalagmites, murmuring rivers, and more that make up this fascinating subterranean paradise that was shaped by tiny droplets over millions of years. Here is a fun fact: The world's first railway in an underground cave was opened here in 1872.

Glide through the underground wonderland by train, then hop out for a guided walking tour to learn more of the cave's secrets. You might even meet the baby dragons - or olms - that live here. Shrouded in myth, these fascinating creatures are considered one of the largest cave-dwelling animals that can go without sustenance for up to 10 years.

The journey continues with a picturesque pause, offering you a chance to capture the beauty of Predjama Castle in photographs and savor some leisure time amidst its historic splendor. Perched majestically on a towering 400-foot-tall cliff, this medieval castle's roots trace back to the 16th century, while legends hint at fortifications on this site even from the 13th century. Learn how the knight Erazem of Predjama would use the cave network to his advantage, even withstanding an army's siege of the castle for over a year. As your time at the castle concludes, you'll return to Koper, where your unforgettable expedition comes to an end.

The cave tour is suitable for all, including families with young children and those with mobility impairments. The temperature inside the cave system is about 50 degrees Fahrenheit year-round.