Seaplane Harbour (Lennusadam)

Lennusadam sits inside the world's first large-span reinforced-concrete shell structure — three enormous domes built in 1917 for the tsarist navy's seaplanes. After decades of neglect it reopened in 2012 as one of Europe's best maritime museums, and children have not stopped raving since. The centrepiece is Lembit, a 600-tonne British-built submarine from 1936 that served under Estonian, Soviet and finally museum flags: you walk right through its cramped interior, past the torpedo tubes and the tiny galley. The hangars were engineered by the Danish firm Christiani & Nielsen as part of Peter the Great's Naval Fortress, abandoned by the Soviet navy, and left roofless and burnt out for years. The restoration left the concrete deliberately raw — water stains, patched shell holes, rusting reinforcement bars on show — so the building is half the exhibit. Look up before you look at the boats.

Around the sub the hangar is packed with historic craft — a Short 184 seaplane replica hanging from the shells, the Suur Toll steam icebreaker moored outside, minesweepers, a Nazi mini-sub, and dozens of small boats. Kids can steer virtual ferries, fire deck guns, and climb through cargo holds. Outside on the pier you can board the icebreaker for another dose. There is a good cafe with a harbour view and a genuinely tempting shop. The single hall is organised by element rather than by date — what flew above the water, what floated on it, what went beneath it — so there is no route to follow and no wrong way round. Give the walkways above the basin ten minutes: they are the only place you see Lembit's whole hull and the hanging seaplane at eye level at once.

Buy the combined ticket with Fat Margaret (€30, saves €6). Come first thing at 10:00 or after 17:00 to dodge school groups. The 20-minute walk from Balti jaam through Kalamaja's wooden-house streets is one of the loveliest introductions to any museum in Tallinn — and lets you eat afterwards at Kalamaja's cafes or in Noblessner harbour next door. Bus 73 from Viru Keskus stops right outside. Do the submarine first, before the queue at its forward hatch builds; the simulators and the play areas are still there at closing time, and nobody minds if children ride the same virtual ferry four times. Budget three hours if you have kids in tow, ninety minutes if you are two adults who want to read the captions and leave.

Bus 73 leaves from the Viru Keskus terminal and reaches the Lennusadam stop in about fifteen minutes, dropping you within sight of the hangar doors; a ticket from the driver costs €2. Buses are not frequent, so photograph the return timetable at the stop before you go in. The alternative is the walk: twenty minutes from Balti jaam railway station through Kalamaja's wooden streets, or twenty-five to thirty minutes from Fat Margaret at the bottom of Pikk along the Kalaranna seafront promenade. A taxi from the Old Town runs about €7-10. Drivers park in the lot in front of the hangar at Vesilennuki 6, reached off Kalaranna, and it fills by midday in July. If you are staying at Go Hotel Shnelli or anywhere in Kalamaja, skip transport entirely. Best plan: bus out while you are fresh, walk back along the water.

Tickets are €20 for adults, €12 for children aged 8-16, €10 concession for students and pensioners, and €40 for a family; under-8s go free. Booking on the museum website knocks €2 off each ticket, which is the only discount most visitors will get. The combined ticket with Fat Margaret in the Old Town is €30 and saves €6, but only buy it if you genuinely intend to walk back to Pikk 70 — plenty of people never use the second half. Everything inside is included: the submarine, the simulators, the deck guns, the play structures and the icebreaker on the quay. Extra spend is the cafe and the shop, and the shop is a real risk with children in it. Tallinn Card holders walk in free, which for a family of four is where that card starts to pay for itself.

The museum opens Tuesday to Sunday 10:00-19:00, closes on Mondays from October to April, and runs daily through July and August. The quiet window is the first hour: arrive at 10:00 and you will have Lembit's interior more or less to yourself. From about 11:00 to 14:00 on weekdays the hangar fills with school groups and the concrete acoustics turn it into a swimming pool at full volume; after 17:00 it empties again, and two hours is enough. Sunday afternoons are the family peak. Rain is the best possible reason to come — this is the strongest wet-weather afternoon in Tallinn. In deep winter bring a proper coat, because the hangar is unheated and the quay can be icy enough that the icebreaker's upper decks are roped off. If you want the harbour and the promenade too, come between May and September.

It suits children of roughly 5 to 12 better than any other museum in the city, and teenagers stay engaged far longer than they will admit thanks to the simulators. The main hall is flat concrete and step-free, with room for wheelchairs and buggies throughout, but the inside of Lembit is reached by vertical ladders through narrow hatches and the icebreaker's decks involve steep companionways — neither is accessible, and neither works with a pushchair. Anyone claustrophobic can skip the submarine interior and still see the whole ship from the walkways. Skip the place entirely if you have a one-hour gap before a train or a ferry: the round trip from the Old Town eats forty minutes on its own. Adults with no interest in ships or engineering will get a good hour out of the architecture and then start looking at the cafe.

Noblessner, the former submarine-building yard, begins five minutes along the water and is the obvious place to spend the rest of the day: the PROTO Invention Factory in the old foundry (a separate ticket, and the better wet-weather follow-up), the Pohjala Tap Room, Lore Bistro, Kai Art Center in a converted workshop, and the Iglupark floating saunas on the quay if you fancy a swim afterwards. Patarei Sea Fortress, the grim limestone prison, is a ten-minute walk east. Kalamaja cemetery park is twelve minutes inland, Telliskivi Creative City and F-hoone about twenty, and Balti Jaama Turg market roughly the same. A workable half-day: hangar at 10:00, lunch in Noblessner at 13:00, PROTO or Patarei after. Volta Noblessner Tallinn and Bob W Tallinn Telliskivi put you inside this whole loop on foot.

The honest caveats. Despite the name there is essentially one aeroplane — the Short 184 replica — so anyone arriving expecting an aviation collection will be disappointed within ten minutes; this is a maritime museum in an aviation building. Captions are short and object-led rather than narrative, so if you want the story of Estonian shipping and independence you get more of it at Fat Margaret. At peak times the queue for Lembit's forward hatch is single file and can run fifteen to twenty minutes, which the guidebooks never mention. Some of the interactive stations are visibly worn from a decade of small hands, and one or two are usually out of order. And €20 for a solo adult is steep for what is a two-room building — go with children, or pair it with Fat Margaret on the €30 ticket, or leave it.

Hours & entry

Not free

Tue-Sun 10:00-19:00 · Mon closed Oct-Apr, open Jul-Aug

What to see

• Walk-through interior of submarine Lembit — Central hall, main basin
• Suur Toll steam icebreaker on the pier — Exit through the eastern doors to the outdoor quay
• Hanging Short 184 seaplane replica — Suspended below the western dome

Tips from the ground

• Combined ticket with Fat Margaret Tower (€30) saves €6.
• Avoid 11:00-14:00 on weekdays when school groups fill the halls.
• Bring a jacket — the concrete hangar is unheated and cool even in July.