The real photo has been searched by Google. See
You can scroll through the blue line and download colorful photos.
That photo was Prior to the 20th century, when the color camera was not invented. You'll say - this can be done in Photoshop too. It is not Difficult to do This in Photoshop Software. But not everyone can use Photoshop because it is Complicated. It's expensive software. Here you can Change any Photo in 10-15 seconds Free of Cost.
Website : http://demos.algorithmia.com/colorize-photos/
@chnadrakant111 for more Information"