These Graffiti Alleys Actually Contain Murals Worth Millions Of Dollars
"those / these" are determiners and are used before nouns to refer to a particular group of things / people, e.g. these people / those rules / those buildings. Update: 题主问的是What are those? 然后他.
A stoner's guide to Philly murals: 11 of the trippiest artworks in the city
