If You Lived Here Houses of the World by Giles Laroche*

This is such an interesting book!  Two page spreads describe unique house constructions around the world.
It is multi-level/age too.  One can read the main paragraph and learn a lot or can also read the smaller print that shares more details about the house.  For my preschooler I read the main paragraph.  With my seven year old, I read all of the text.
My favorite text feature was the map showing where each of the house types was located.
*Highly recommend.
Text features: map, bold print, chart