Koper to Grotta Gigante and Postojna Cave: Day trip

Delve into the mysterious depths of the world's largest tourist cave system, admiring incredible displays of ancient stalactites and stalagmites that get more dramatic as you descend.

What to see

• Intricate mineral formations and hidden caverns

• The massive main hall, the largest of its kind in Europe

What to do

• Descend 330 feet (100 meters) to see the surreal formations hidden in its chilly depths 

• Visit the family-friendly immersive science museum on the surface, offers fascinating insight into the cave’s geological history

What to bring

• The internal temperature is constantly around 52 degrees Fahrenheit (11 C), so pack a light jacket

Take note

• HOURS: Closed Mondays, Open for tours Tuesday through Sunday from 10:00-12:00 and 14:00-16:00

• Reservations are required; book online here: https://www.grottagigante.it/en/home/ 

Continue your subterranean journey by visiting Slovenia’s intriguing Postojna Cave, where geological formations mimic the mountains and rivers of the country above.

What to see

• Walking paths below the surface descend past intricate karst formations, murmuring springs, and winding rivers

• Aquarium exhibits housing unique cave-dwelling olms, often called “Baby dragons.”

What to do

• Take the underground train tour to explore the vast underground halls, including the fairytale-esque “Dance Hall” 

Take note

• Expect year-round cool temperatures in the caves

• Tickets must be purchased in advance: https://www.postojnska-jama.eu/en/tickets/