Bookmark / Last Timecode on Timeline

Would love to have a keyboard shortcut to bookmark a spot on the timeline, and then be able to go back to that spot later.  Thinking something like the "last channel" button on a TV remote control.  Basically, a temp marker that can be turned on/off easily

Sometimes, I am working on a section of the timeline and then move somwhere else on the timeline to look for a clip.  It would be nice to be able to go right back to where I was originally.  Instead of having to remember and type in the time code, or searching the timeline again. 

For example, if i am at 01:24:12;12 on the timeline, it would be nice to be able to click "CMD+2" to set a bookmark for that spot, and then if I scroll ahead to 03:18:08;09 and want to go back, i would be able to click "CMD+3" to go back to the orignal bookmark at 01:24:12;12.  And then "CMD+2" again to turn off the mark.