Getting around Warsaw
Currency - PLN
Poland is a member state of the EU, but the currency here is not Euro but Polish Zloty (PLN).
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You will be able to use your card to pay in the vast majority of places.
Travel adapters
Poland uses type C and E plugs, so if you are travelling from the UK or a country which uses different sockets, you will need a plug adapter.
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See here for more details.
Language
The official language is Polish but you can get by with English in most places.
It's always nice to start an interaction with a Polish 'Dzień dobry' (hello). Other useful phrases include 'Dziękuję' (thank you) and 'Przepraszam' (excuse me/sorry).
Public transport in Warsaw
You can easily use your Uber or Bolt app here, but Warsaw has also a good and very affordable public transport system - see the tips below on how to make the most of it.

Buses, trams, and metro
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Warsaw offers an extensive network of buses and trams, and there are two metro lines (M1 and M2).
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You can find the metro layout here. Just to give you an idea of the city, the "Centrum" station on the M1 line is in the centre of Warsaw, right by the Palace of Culture and Science. The "Nowy Åšwiat - Uniwersytet" station on M2 is near the old town (and the university Jo attended as an undergrad student).
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For planning your journeys, see the below app.

Your app for public transport
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We highly recommend downloading the 'Jak dojade' app.
This app allows you to plan your journey from point A to B, check live schedules, and buy tickets. Although you can buy paper tickets in ticket machines, we find it far easier to buy e-tickets through the app. Once purchased, you need to validate the ticket when you get on the bus/tram/metro by scanning a QR code through the app.
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Ticket controllers are very common in Warsaw and they are ruthless! Make sure you buy and validate the right ticket to avoid a potential fine.

Tickets and fare zones
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When buying tickets, you have to choose if it's for zone 1 or zones 1 + 2.
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Warsaw is entirely in zone 1 and it's only when you leave the city that you need the additional zone 2, so you will only need zone 1 tickets if staying in Warsaw.
You can find a map of the zones here.
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You need to select between a 'normal' and a 'reduced' ticket. I believe all wedding attendees will require normal tickets as reduced tickets are only for some groups of people, such as students, and will require documentation.
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To give you an idea of costs, a normal ticket valid for 75 minutes for zone 1 costs around 90p, and a normal ticket for zone 1 valid for 3 days is £7.20.