AHHAA! as in, 'Oh, that's how that works!' One of the city's biggest attractions by far, this vast, super-modern centre invites people of all ages to discover - or rediscover - just how fun science can be. Here you can spend hours trying out the over 80 riveting, often wacky hands-on exhibits. These will have you taking an elevator into the bowels of the earth, biking across a tight-rope and losing yourself in mirror maze. Be sure to check the schedule for the amazing Science Theatre shows where things bubble, smoke and go bang. The cutting-edge planetarium shows (slightly extra) are also well worth checking out. 

Admission: adults €12, kids over 6 years of age €9, family ticket €26. Group rate is €8 a person - upon prior arrangement. Ticket price includes a 20% discount at the Aura Keskus water park located right next door.