they all share a hint of rococo but all are certainly heavily influenced by the late 1580 mannerist period.  The heavy posterization certainly is a dead giveaway. 

"Eclectic style."

1-3: Hobbiton

4-6: Capitalism

1. Definitely British/French Arts & Crafts, Art Nouveau from the late 19th century. Look up Owen Jones and Hector Guimard.

2. Pretty utilitarian space so "style" is harder to pin down. Something between Tudor Revival and Neo-Gothicism. Look up cabinets of curiosities from the 17th century.

3. The interior looks early 20th century modernism, but each are pretty vague. Look up commercial interiors from Adolf Loos and other German architects. 

4. Capitalism

5. Also early 20th century Tudor-Gothic style, with a massing that looks like 1920s colleges and institutions in the US.

6. Yes, Capitalism, but look more specifically at the late 19th century department stores in Europe. Le Bon Marche in Paris. It also vaguely reminds me of the massive neo-classical buildings in the USSR and PRC at different points in the 20th century.

Keep in mind that these images are very much collages... they aren't "accurate" to these suggestions. Have fun! Library books are very useful for references, a bit less maddening than the internet. 

The depicted architecture style seems to be neoclassical, which is marked by the revival of classical Greek and Roman architectural elements. The symmetrical façade, decorative columns, and pediment atop the entrance signify this style. Neoclassical architecture often imparts a sense of grandeur and timelessness, drawing inspiration from ancient civilizations while integrating modern techniques and materials.