Abroad Attrac.

Batobus Paris hop-on hop-off Seine boat at EUR 23: 9 stops in a 1 h 42 loop, and 48 hours costs a family of four EUR 16 more

Leonardo da Vinci science museum in Milan at EUR 13: his sketches built as models, EUR 8 for ages 3 to 26, EUR 10 more to board the Toti submarine

BIGc HyperBowling in Brussels, 8 glowing lanes: four players pay EUR 8.50 less in total than three

Challenge Lab Brussels, 7 rooms in 60 minutes: a family of four on the group rate saves EUR 14 in the afternoon

Musée Guimet in Paris at EUR 15: Europe's largest Asian art collection, two adults and two teens pay for two

Immersive Dutch Golden Age in Amsterdam at EUR 18.00: 325 paintings inside about 50 minutes

Madame Tussauds London at EUR 31.46: the same brand in Amsterdam is EUR 16.00, so is the EUR 15.46 gap worth it

Harry Potter: The Exhibition in Brussels runs to 8 November: the family pack saves two adults with two children at least EUR 7

Venice Museums Pass at EUR 50 for the Doge's Palace and eleven civic museums: subtract the ticket you were buying anyway

Harry Potter studio in London with return coach from EUR 102.67: board at the British Museum on a September weekday and pay EUR 31.53 less than in October

Quiz Room Ghent can be played in English: two adults and one child pay EUR 63.75 together, EUR 2.25 less than three separate tickets

Henry VIII's Hampton Court from EUR 33.87: two adults and two children pay EUR 101.62 midweek, EUR 10.50 more at a weekend when the kitchen fire is lit

Space Explorers ISS VR in Lille from EUR 22: on the family ticket each adult pays EUR 16, EUR 6 less

Tower Bridge glass floor from EUR 21.04: a family of two adults and two children pays EUR 56.81, EUR 6.31 less than four single tickets

TimeRide Cologne puts you on a 1926 tram in VR: families pay EUR 17.90 each on the official site, students save EUR 4 on Fever

Louvre 3-hour English guided tour from EUR 71.90: a non-EU passport with Dutch residence still gets the EUR 22 EEA rate

Villa Cavrois near Lille at EUR 11: under-18s go free, so a family pays only for the adults

Accademia Gallery in Florence: Michelangelo's 5.17 m David for EUR 31 with an audio guide app, or EUR 20 plus a EUR 4 booking fee

The View from The Shard at EUR 27.98: an open-air skydeck, and EUR 5.83 less than the London Eye on Tiqets

Berlin's Altes Museum at EUR 14: add a second museum the same day and the official EUR 24 island ticket saves four euro

Mind of a Serial Killer in Brussels at EUR 18.90: the rail code decides what it really costs

Duomo di Milano rooftop at EUR 19: the official all-in ticket is three euro more

Minecraft immersive show at EUR 20 debuts in Germany: 20% off after 15:30, only until 2 October

Brussels Card at EUR 50 with STIB transport: at EUR 10 a museum you need five to draw level