Where does bundler installs a git gem locally?

I want to use a gem from git. So in app's Gemfile I write:

gem "some_gem" :git => https://github.com/foo/bar.git

Then I have to install that gem with bundler:

bundler install

or

bundler update bar

When I do this all works just fine, the gem from git is in use. But
where is that gem locally stored? Where does bundler hides it? I connot
find it
neither in /gems directory nor in app's vendor directory. Where does

bundler install

installs that git gem?

gem list some_gem -d

Colin

or:

bundle show some_gem

tamouse m. wrote in post #1112726:

gem list some_gem -d

Colin

or:

bundle show some_gem

The second one did the trick.

It turns out that there is also Bundler's directory where it stores
gems. On my Windows machine it is here:

C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\bundler\gems

Thank you.