Casa Batllo (World Heritage Site) - One of 2 houses by Gaudí in Barcelona that can be toured. truly amazing and worth the visit. go in the mornings, before the site gets crowded with architecture students.
Krzywy Domek, a shopping center in Sopot, Poland is unique in its design. Designed by Szotynscy and Zaleski, its peculiarity is it has no right angle walls. All the wall is designed by curves. The creators were inspired by fairy tales of Jan Marcin Szancer and Per Dahlberg to create this unique structure.