Filter views

1)
I would like to be able to create a view that takes a part of a url or a keyword and display a list of nodes/”albums” based on that value. It might be easier if I describe what I have and what I would like to achive;

I have different photoalbums, that each has it’s on “folder”

This is how the meny looks now;

Gallery <- top level menu
	Street
	Summer
	Travels <- sub menu
		Greece
		Italy
	People

and so on. I would like to have a view that from the top link (Gallery) shows all photo albums, but from a submenu such as Travels, I’d like the overview page just to show those (2) albums that has the link mysite.com/gallerys/travels

So, the url mysite.com/gallerys will show all gallerys (this is a simple view and its working right now), but from the sub menu Travels (mysite.com/gallerys/travel), would only show those nodes/albums.

How do I manage this, preferably whithout adding a module?

2)
And if it’s possible, I’d like to be able to count the number of images in each “album”

Drupal version: 


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