Connect the images.
The connect is the ‘Art Nouveau’ movement. Images depict the art style, the Paris exhibition where it became famous, the magazine ‘Jugend’, the store ‘Liberty & Co’, Poster for 2004–2006 exhibition at the Van Gogh Museum, Amsterdam about the Maison de l’Art Nouveau, the city of Riga,Latvia renowned for its Art Nouveau architecture etc.
You can find all essential details here and here and here and also here.
Phew! Good crack by M.S. Srinivas.