Two ships, two Mediterraneans
— and one €110 mistake.

Ascent's homeport

Civitavecchia — for Rome

The signature — and it is not the Colosseum: Rome's most-photographed ruin is the Colosseum; its most astonishing building is the Pantheon, and it is free. Hadrian's rebuild of around 126 AD still holds the record for the largest unreinforced concrete dome on earth — 43.3 metres across and exactly as tall as it is wide, so a perfect sphere would fit inside. Go at opening, when the oculus throws a hard white disc of light onto the coffered ceiling. The detail guides skip: the floor is very slightly convex and drilled with twenty-two drainage holes, because rain falls straight through the open oculus and always has. Stand there in a shower and watch it work.

What the locals do instead

• The train, done properly — port shuttle to the gate, then Civitavecchia station. Take the regional to Roma San Pietro, about €5 and 50–60 minutes: get off there rather than Termini and you are ten minutes from St Peter's
• Tarquinia's painted tombs — twenty minutes away, about €6. Fourth-century BC Etruscan chambers frescoed with dancers and divers, and you descend one at a time into a lit, sealed room. You may have it to yourself
• Ostia Antica instead of Pompeii — Rome's own port city, forty-five minutes from the centre on a €1.50 metro ticket. Standing apartment blocks, a climbable theatre, the mosaic floors of the shipping guilds: Pompeii without Pompeii's queue
• The Terme Taurine — Roman baths built out for Trajan on a hill four kilometres from the port, about €5, sea views, almost no visitors. Ninety minutes, total

The best-located berth in the Mediterranean

Naples

The signature — and it is not Pompeii: everyone goes to Pompeii; the thing you will still be thinking about a year later is a marble body under a marble sheet, ten minutes from the ship. Giuseppe Sanmartino carved the Veiled Christ in 1753 from a single block, and the veil is so thin you can read the wounds through it. Timed entry, twenty minutes inside, no photographs — go at opening, because slots vanish by mid-morning. The detail guides omit: the chapel's patron was an alchemist, and in the basement stand two "anatomical machines" — human skeletons with the entire circulatory system rendered in wire and wax. Nobody is quite sure how they were made.

What the locals do instead

• The Circumvesuviana to Pompeii, done right — about 35 minutes and €3.30. The trap that catches thousands every season: alight at "Pompei Scavi–Villa dei Misteri" on the Sorrento line, not "Pompei Santuario" — the latter is the modern town, a mile from the gate. The air-conditioned Campania Express on the same route is far more civilised at about €15
• Herculaneum instead of Pompeii — twenty minutes on the same line, about €16 to enter. A quarter the size and twice the preservation: carbonised wooden doors, surviving upper floors, mosaics still coloured. Properly seen in two hours, and the correct choice on a short call
• Ferry to Procida, not Capri — 40 to 60 minutes, €15–€22 each way. Procida is the small, painted, unglossy island: Marina Corricella is a working fishing harbour, lunch is €25 rather than €70, and you queue for nothing. Capri in July from a cruise ship is a queue with a view
• Napoli Sotterranea — Greek quarry to Roman aqueduct to wartime air-raid shelter, forty metres beneath the old city. €12–€15, guided, ninety minutes, and blessedly cool in August
• Pizza as the actual plan — Da Michele, Sorbillo, Di Matteo, all near Via dei Tribunali and fifteen minutes from the ship, €5–€9 a pizza. No queue at 11:30, forty-five minutes at 13:00. A perfectly defensible use of a short call

The tender port everyone underestimates

Santorini

The signature — and it is not Oia at sunset: the caldera itself. A ten-kilometre flooded volcanic crater left by the Late Bronze Age eruption, with the villages strung along a 300-metre cliff of layered pumice and red scoria. You are standing inside a volcano, and the rim you walk is the eruption's cross-section — the same ash layer that buried Akrotiri. The detail guides omit: for much of high summer the sun does not actually set into the caldera at all; it tracks north-west and drops behind Therasia. The shot people queue three hours for in Oia is often better from Imerovigli or the Skaros saddle, with a tenth of the crowd.

What the locals do instead

• The KTEL bus network — the genuinely underused move. Single fares around €2.20, paid to the conductor on board, with every route radiating from Fira's central station five minutes from the cable-car top. It undercuts every taxi and most tours on the island
• Ancient Akrotiri, €20 — the Bronze Age town buried by the eruption, under a modern roof so it works in any heat or weather: two- and three-storey houses, drainage, frescoes in situ. Closed on Tuesdays — the single most important line here if your call falls on one
• Pyrgos — the old Venetian hill capital: castle ruins, near-empty lanes and a 360-degree view taking in both coasts. Free, fifteen minutes from Fira, and where you go when Oia is unbearable
• Skaros Rock — a twenty-minute walk down from Imerovigli onto the medieval fortress headland, which puts you inside the caldera view rather than looking at it

Where the car is worth it — but not for the town

Dubrovnik

The signature: two kilometres of fifteenth-century wall, up to twenty-five metres high and six thick, entirely enclosing the town. Ragusa bought its independence for centuries rather than fighting for it, and spent the savings on masonry — the walls are the physical form of a foreign policy. Walk anticlockwise from Pile at opening, while the sea section is still shaded. The detail guides omit: from up there you can read the 1991–92 shelling as a map — the brighter, newer orange roof tiles mark every building that took a hit, and they cover roughly two-thirds of the Old Town. Note also that the circuit is one-way in season: miss a photograph and you cannot go back for it.

What the locals do instead

• Buža — two bars reached through a literal hole in the seaward city wall, with terraces bolted to the rock ten metres above the Adriatic and ladders straight down into deep water. Passing through the wall is free; you pay only for a drink at €5–8. Bring swim things under your clothes — there are no changing facilities. The best free thing in Dubrovnik
• Lokrum island — a fifteen-minute ferry from the Old Port, roughly €27 return including island entry: a Benedictine ruin, a Habsburg botanical garden with free-roaming peacocks, and a small salt lake you can swim in. Check the last boat on the board — being stranded on Lokrum is a recurring cruise-passenger story
• Mount Srđ on foot or by road rather than by cable car, for the panorama over the Old Town, Lokrum and the Elafiti islands

The rest of the map

Ports, quickly

• Santorini — a tender port with a cable-car bottleneck. Go straight to Oia on landing and see Fira on the way back; doing it in the obvious order costs you an hour in a queue
• Kusadasi — exists for Ephesus, and this is one of the few ports where a proper guide genuinely changes what you see. Ask about the Terrace Houses, which most groups skip
• Dubrovnik — walk the walls at 08:00 sharp. By ten it is sun without shade and a slow-moving single file
• Villefranche and Portofino — tender ports on the Riviera, where the local train is faster, cheaper and more pleasant than any coach: Nice and Monaco are both easy DIY
• Madeira, on Xcel's autumn Iberia loops — levada walks along the water channels, or the Monte toboggan run. A rare call on any itinerary, and the one to prioritise if it appears on yours