Piscina Mirabilis | TravelDojo

Piscina Mirabilis at a Glance#

Address: Piscina Mirabilis, Bacoli (near Naples), Campania, Italy

Hours: Daily 9am-6pm (seasonal variations possible)

Admission: Adults ~€6-€10 (typical range; check local site for current rates)

About Piscina Mirabilis#

The Piscina Mirabilis is a large Roman subterranean cistern at Bacoli in Campania, Italy, built in the early Imperial period (1st century AD) to store fresh water. It is one of the largest surviving Roman cisterns on the Italian peninsula.

The interior is a spacious vaulted brick-and-concrete hall supported by rows of square pillars, with a raised central walkway and narrow side passages. The chamber measures about 70 m long and 25 m wide and reaches up to roughly 15 m in height, creating a dramatic, echoing space below ground.

Constructed in the 1st century AD to supply water to the Roman naval base at Misenum (Classis Misenensis), the Piscina Mirabilis served as a pressurized freshwater reservoir for the fleet and nearby settlements. Its solid Roman engineering and waterproof opus caementicium walls preserved the cistern in good condition compared with many other Roman hydraulic works.

The site sits near the town of Bacoli on the Phlegrean Peninsula, close to the archaeological area of Misenum and the Bay of Naples, roughly 20 km west-northwest of the city of Naples.

Visitor note: The cistern’s interior is a single vaulted hall with a raised central walkway and low lighting; sturdy shoes and a light jacket are recommended for the cool, damp interior.

How to Get to Piscina Mirabilis#

Piscina Mirabilis is located in Bacoli, a short drive west of Naples. The site is reachable by local Circumflegrea trains to Bacoli and a short taxi ride or by car via the SS270 coastal road. Local signage from Bacoli town centers directs visitors to the cistern.

Tips for Visiting Piscina Mirabilis#

Visit mid-morning to avoid busier guided groups and to see the cistern before afternoon tours arrive.
Bring a flashlight-some lower vaults are dim and the scale is better appreciated up close.
Combine the visit with nearby Roman sites such as the archaeological areas of Misenum and the amphitheatre at Pozzuoli.

Best Time to Visit Piscina Mirabilis#

The cistern is an indoor/archaeological visit best undertaken in spring or autumn when crowds and summer heat are reduced.

Spring

April-June · 12-24°C

Mild weather and fewer summer tourists make visits pleasant.

Autumn

September-October · 15-24°C

Good light for photography and more moderate temperatures.

Weather & Climate near Piscina Mirabilis#

Climate

Piscina Mirabilis's climate is classified as Hot-Summer Mediterranean - Hot-Summer Mediterranean climate with warm summers (peaking in August) and cold winters (coldest in January). Temperatures range from 6°C to 29°C. Moderate rainfall (906 mm/year).

Air Quality: AQI 42 Good

Best Time to Visit

JulyAugustJune

Temperature & Rainfall

Temperature Range

41°

Warmest Month

-4°

Coldest Month

Monthly Conditions

Month	Comfort	Temp	Feels	Rain	Sky	Humidity	Wind	UV	Daylight
January	Acceptable	6° - 13°	8°	101 mm	partly cloudy	85%	2.6 m/s	0.2 low	9.5h
February	Acceptable	6° - 13°	8°	82 mm	partly cloudy	83%	2.9 m/s	0.4 low	10.5h
March	Good	7° - 15°	11°	72 mm	partly cloudy	81%	2.9 m/s	0.8 moderate	11.8h
April	Very Good	9° - 17°	13°	73 mm	partly cloudy	77%	2.8 m/s	1.2 high	13.1h
May	Very Good	13° - 22°	17°	43 mm	some cloud	71%	2.5 m/s	1.7 very high	14.3h
June	Ideal	17° - 25°	21°	23 mm	mostly sunny	63%	2.5 m/s	2.1 extreme	14.8h
July	Ideal	19° - 28°	24°	18 mm	clear	58%	2.3 m/s	2.2 extreme	14.6h
August	Ideal	20° - 29°	24°	36 mm	clear	58%	2.2 m/s	1.9 very high	13.6h
September	Excellent	17° - 26°	21°	80 mm	mostly sunny	67%	2.2 m/s	1.2 high	12.3h
October	Very Good	14° - 21°	17°	123 mm	some cloud	75%	2.3 m/s	0.7 moderate	11.0h
November	Good	9° - 17°	13°	144 mm	partly cloudy	83%	2.5 m/s	0.3 low	9.8h
December	Acceptable	7° - 14°	11°	111 mm	partly cloudy	85%	2.9 m/s	0.2 low	9.2h