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Grotta di Nettuno
Tickets: book ahead or walk in?
The cave can be busy in summer, but walk-in tickets on the day are normally available.
Not verified yet, check the official site before you go
Timed entry
Yes
Typical price
EUR 16
Busiest
midday, July and August
Quietest time
first hours after opening
Skip-the-line ticket
Worth it
Best time to visit
Visit late morning (10-11 AM) when the sun is high enough to illuminate the cave's interior through its underwater opening. May through September offers the calmest seas and the most reliable boat access if you want to skip the stairs.
Budget tips
Entry costs around 14-16 EUR for adults; children under 6 enter free. A combined ticket with the nearby promenade ferry (5 EUR one-way) saves you from climbing back up those 654 stairs.
Plan your visit
1.5-2 hours
About
Quick facts: Carved by waves over millions of years, this sea cave stretches 120 meters deep and reaches heights of 30 meters inside. Its name comes from the Roman god of the sea, and visitors reach the entrance by descending 654 stairs carved into the cliffside.
Highlights: On calm summer evenings, sunlight filters through an underwater opening creating an otherworldly turquoise glow across the cave walls. The cave houses a population of rare white cave shrimp that survive in complete darkness, visible only when a guide's flashlight catches their translucent bodies drifting through the water.
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