I need to add a sidebar, when i click on "TOWNS" Moscow it will show me museums/theatres/churches that is in moscow (only as photo categories, after that i will click on *museums {photo} and it will show me all museums in moscow..) + ( i need "PLACES" everytime i click on a different "TOWN" ), after that i will click lets say petrovska street & it will show me the museums/theatres/churches on that street..

(I hope my photoshoped picture will help you to understand what i mean..)
Thank you!