Man Mandir in Varanasi is a historic palace built by Raja Man Singh of Amber in the early 17th century. Located beside the famous Dashashwamedh Ghat, this beautiful sandstone structure is known for its Rajput and Mughal-style architecture. The palace houses an ancient observatory built by Maharaja Jai Singh II, which was used to study stars and planets. From its terrace, visitors can enjoy stunning views of the River Ganga and the ghats below. Man Mandir is a perfect blend of history, science, and spirituality, making it a fascinating place to explore in Varanasi.