Powershell to the rescue!
Of course, if you're an administrator with shell access to your farm, you can always resort to Powershell to get that answer. All you have to do is get the WebTemplate property of the SPWeb object for the site thus:
Write-Host (Get-SPWeb http://sharepoint.crayveon.com/sites/site123 | Select WebTemplate);
Alternatively, you could use the Get-SPSite cmdlet at the beginning of the pipe to get all the sites and sub sites and their templates thus:
Write-Host (Get-SPSite http://sharepoint.crayveon.com/sites/site123 | Get-SPWeb | Select URL, WebTemplate);