Over the years, Parthenon was converted as house of worship for other religions. In 5th century AD, it was converted into a Christian church and dedicated to Virgin Mary. In 15th century after Ottoman conquest, this was converted into a mosque. Sometime in 17thcentury part of it was converted into ammunition dump. During Venetian attack, this was bombarded and the explosion caused massive damage to the magnificent structure.
Many of the surviving sculptures were collected by Thomas Bruce, 7th Earl of Elgin sold to British Museum in London and are displayed there. The Greece government wants these Elgin Marbles or the Parthenon Marbles returned and they are very right in their demand.
Here are some pics of Parthenon. Massive work is on to get back its past glory and I hope they complete it successfully in a short duration. The whole world is waiting to see the grand splendor of this building!