The grand "Lotus Temple" is termed by many as the Taj of modern India. Its distinctive lotus shaped marvel in marble is surrounded by a landscaped garden and is a symbol of peace. It is a very recent architectural marvel of the Bahai faith. It was completed in 1986.
It is made of marble, cement, dolomite and sand. It reaches a height of more than 40m. One can see 27 giant white petals of marble in a lotus shape, springing from nine pools and walkways indicative of the nine unifying spiritual paths of the Bahai's faith. The Bahai's lay great emphasis on prayer and meditation. They believe that these are important instruments for the progress of the human soul, both in this world and the next. The Bahai's pray to one God, the Creator of the Universe. The act of praying is described as 'Conversation with God' and meditation is perceived as the 'Key for opening the doors of mysteries'. In that state, man withdraws himself from all outside objects and immerses himself in the ocean of spiritual life.
Source : http://www.indiaplaces.com/india-monuments/delhi-lotus-temple.html