Mosque in Purana Quila, Delhi

Picture of Solomon’s seal on the walls of a mosque is courtesy of "highlandmc" who published it on Flickr and wrote in the caption: 

I saw the star of david in most of the mosques in India. In midage it was a commonly used sign.
Purana Qila means Old Fort and it was built by the Moghul emperor Humayun in the 16tt century in Delhi, India.