Many don't know this, but within the banner at the top of every space/forum in the community there is some navigation help.
Beneath the name of the space you are in you will see the name of the parent space listed with an arrow next to it.
Click on that arrow to see the entire hierarchy you are currently un on up to the top level.
It's also worth noting that the URL for landing pages (not the content itself) includes the spaces that they are sitting in.
Here you can see Data Integration sitting within Pentaho sitting within Products and Solutions