How to create this "dramatic" effect in photos (examples in the thread)?

[Mislav28755659f88e]

Hi all,
I am trying to make some posters for my apartment, downloaded some images from unsplash and now trying to edit them to make them pop. I found the same images, edited, on another forum (but they are low res) and now I am wondering how they achieved the "dramatic" effect that really makes them stand out?
I converted images to black and white, and played with saturation, brightness and some photo filters, but can't achieve anywhere similar results.
What do you think the person used to turn the images the way they did? Are there any tutorials you can point me to?
Thank you so much for your help 🙂
My image 1: https://ibb.co/bFrWvTp
Edited image from another user 1: https://ibb.co/GkM8BKN
My image 2: https://ibb.co/0y7wY4S
Edited image from another user 2: https://ibb.co/bdqY4Cg
My image 3: https://ibb.co/4m9XgKD
Edited image from another user 3: https://ibb.co/GRfGKDs

[c.pfaffenbichler]

I converted images to black and white, 

How exactly? Hue/Saturation Adjustment Layer, Black & White Adjustment Layer, …? 

[Kevin Stohlmeyer]

Hi @Mislav28755659f88e honestly these look like they've been run through old school Brightness and Contrast to blow out the contrast.

[c.pfaffenbichler]

I suspect the gray-conversion may have affected cyan/green areas differently than in the OP’s conversion. 

[Lumigraphics]

Many ways to increase contrast. Have you contacted the photographers to ask them?