Exchange rates:

• http://www.nbp.pl/Kursy/KursyA.html

Time zones:

• http://www.timeanddate.com/

Weather:

• https://www.yahoo.com/news/weather/
• http://www.imgw.pl/index.php?lang=pl

Useful websites for traveller:

• http://www.about.com/travel/
• http://www.hostelworld.com/
• http://www.lonelyplanet.com/
• https://www.expedia.com/
• https://pl.tripadvisor.com/