I don't know what post processing software you use but as someone else posted on this thread, the Nik Silver Efex Pro software will give you the best software available for converting images to black and white. It is great.
However please understand Silver Efex works as a plug in - you need to install it over Photoshop or Lightroom or something like the software I use - Corel Paintshop Pro. You cannot just use Silver Efex on its own as it needs to run in conjunction with a stand alone image editor.
Also I noticed that in addition to being in monochrome, the "local contrast" in the image you displayed is very high (as is the global contrast). High local contrast gives that very crisp, very detailed, almost over-sharpened look to the image you provided. if you want to replicate it exactly you may need an image editor that supports local contrast adjustments. I think Silver Efex can to some extent (its filter for this is called "structure" and there is an adjustment slider for it within the plug in. It is good but you may want more control than it gives you).
You would do well to research the extent to which other image editors do this kind of thing as well. I use Corel Paintshop Pro as my "base editor," instead Photoshop. It has a local contrast filter built in. Do not over do it however as local contrast is an effect that produces unpleasant artifacts if applied too much.
A further option is another Nik plugin called Color Efex Pro. Within it there is a filter called "Tonal Contrast" which boosts local contrast / structure as well. Again be careful as too much ruins the image by giving it an unpleasant "overcooked" harsh look.
I suggest you do what I do, make a few variants of your base image, save them with different file names and that way you can come back later if you decide that the post processing you have done is overdone and you need to make changes. Also keep the original as a separate unaltered image as well. (Which of course if you shoot RAW will happen automatically).
Here is an image made m Leica and converted using Silver Efex. The local contrast has been dialed up to some extent. I find that stronger loacl contrast works best with things like man made structures - the built environment etc where architectural detail or as in this photo the detail of the statue can be brought out. High local contrast generally should not be applied to portraits as it turns human faces into an ugly caricature. The exception to this rule is where someone has a rugged, craggy weather-beaten face and you wish to bring this aspect out in the photo.
Spooky by
yoyomaoz, on Flickr
And it also works with some landscapes where there is lots of detail and texture to be drawn out.
Coast in black and white by
yoyomaoz, on Flickr