Las Vegas

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This image provided by MGM Resorts International shows a 2012 exterior view of Mandalay Bay resort in Las Vegas. The Mandalay Bay resort in Las Vegas announced Thursday April 24, 2014, a $66 million expansion project that will boost its convention center from the seventh-largest to the fifth-largest in the United States. (AP Photo/ MGM Resorts International)

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This Thursday, Feb. 13, 2014 photo shows railroad tracks in front of La Castaneda Hotel in Las Vegas, N.M. The building is a historic Fred Harvey House hotel built in 1898 to serve as food-and-rest stop along the Santa Fe Railway. In April 2014, the hotel was purchased by Allan Affeldt, who has also restored another Harvey House hotel in Winslow, Ariz. (AP Photo/Albuquerque Journal, Eddie Moore)

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In this April 17, 2014 photo Jamie Gunderson, right, and her husband, John Gunderson, left, visitors from Las Vegas, look at a new interactive touch screen about victims of the bombing that is part of $7 million upgrade at The Oklahoma City National Memorial & Museum, in Oklahoma City. (AP Photo/Sue Ogrocki)

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This image provided by the City of Las Vegas shows, from left, Mayor Carolyn G. Goodman, Councilwoman Lois Tarkanian, Oscar B. Goodman and The Mob Museum Executive Director Jonathan Ullman, displaying the $1.5 million in cash donated to the City Council at a meeting on April 16, 2014 in Las vegas. The $100 bills bundled up and stuffed in suitcases are the first of four annual payments the two-year-old museum plans to make to the city.(AP Photo/City of Las Vegas)