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Ever since I upgraded to Mavericks I can't find any of those two.

Your Library folders are hidden by default in Lion and later. To get to your /Library or /Users/yourusername/Library (also known as the ~/Library) folders in Lion and later:
  • Launch Finder and click Go > Go to Folder and type: /Library or ~/Library
  • Hold the Option key while clicking the Go menu item, which reveals your ~/Library folder in the menu.
  • Make it permanently visible in Finder by entering the following command in Terminal, then press the Enter key:
    chflags nohidden ~/Library​
  • 18 ways to view the ~/Library folder in Lion
 
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