In a colourful ceremony amid songs and dance, Bollywood star Bipasha Basu announced Taj Mahal as one of the wonders. Agra Mayor Anjula Singh received the award.
Indians voted overwhelmingly in the polls cast by over a million people. The polling picked up drastically over the last one month, to see the "monument of love" through to the final seven.
The worldwide poll, in which people could vote for their favourite monument either on-line or through SMS, was conducted by the New 7 Wonders Foundation, a Swiss non-profit group.
The one-and-a-half-hour-long ceremony at Portugal's largest venue, the Estadio da Luz, saw award-presentation appearances by celebrities like Hillary Swank, Ben Kingsley, Cristiano Ronaldo and Neil Armstrong.
The celebrity-studded event also saw performances by Jennifer Lopez, Chaka Khan and Dulce Pontes.
The voting picked up last month and in the latter half of June, eight per cent of all votes came from India, which then further increased to 13 per cent.