Spelunking 101 and Plant Identification Help

Here is a photo post for y'all to enjoy...they don't capture the reality of the smell of the leaves, the sound of the rushing stream nearby, the dripping of the rain onto the fallen leaves, or the giggling of my dear Eric and myself, but I'm pretty proud. 

You see, the photo-genius behind Modern Scribe Photography, Sarah Thomas, has been teaching me how to use all of the twiddly-bits on my camera, I've been excited about getting the pictures I want instead of dealing with the pictures I get! 

I could use a hand with plant identification as well!  Check out the last couple of pictures and let me know if my guesses are correct...(UPDATE:  The identified plants have been labeled!)

Eric found this small cave in an abandoned housing development near his job...armed with flashlights, walking sticks, and a camera, we decided to go investigate how deep it was, and seek our fortunes, and fight kobolds and drow...

But this is from halfway in, looking toward the entrance in the first picture.  The rest of the cave was just dark, wet rock, mud on the ground, and angry cave crickets.  Denied the chance to battle a dragon, we explored the surrounding riverbank.

This was a verdant green, more live than most other plants around.  It struck me as my eyes fell on it, and my brain said "Vinca" (periwinkle), but that is not correct.  There were no visible flowers, does anyone know what this is?

Is this bee balm? Monarda?  Because when I saw it, my heart sang.  But I've never found bee balm in the wild, only big, red-flowered, over-fertilized department store bee balm for landscaping...Can anyone confirm it?

UPDATE:  This lovely purple-flowered plant is Wild Phlox

It was the only spot of bright color among the greens and browns.  I was enchanted!

And then I found more color...can anyone help me identify this berry bramble? 

UPDATE:  These are not berries at all, but rosehips!  I'd never seen them so small before!

It started to rain, so I was more worried about covering the camera and heading home than collecting a berry or two to study.  Silly me!  I don't know the smell or texture of the inside of the berry, and surely don't know what they are.