10 Most Extraordinary Parties in History Slideshow

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2,500th Anniversary of the Peacock Throne

To properly detail the opulence of the 2,500th anniversary of Iran's pre-Islamic Peacock Throne, you might start by considering that the country's first (and gilded) opera house was built specifically for the festivities. Held in 1971, it may be the most expensive party ever thrown, thought to have cost around $100 million. The shah flew in a reported 165 chefs from Paris to serve the best quality caviar, and even switched his country from the Islamic (or lunar) calendar to the solar, Persian calendar to better celebrate the anniversary.

Courtesy of Samuel Coulbourn