Select All Things

I am trying to flip a map and I need to select all of the "things" I have placed. If I select all manually it would take forever Please help.

 

welp gotta bumb this thread.. noone has replied D:

 

No need to bump your thread while it's still on the front page. Just pick one of the 2d views, and use the select tool to draw a box around your entire map. Hit enter, you've selected everything

 

Alternatively, go to edit>map properties and that will select everything as well.