"The Neon Museum officially "opened" with the installation of its first refurbished sign, The Hacienda Horse and Rider, on November 15, 1996 at the intersection of Las Vegas Blvd. and Fremont Street."
The above quote is from The Neon Museum Web site. They are doing some fantastic work. In addition to the Hacienda sign, they restored Aladdin's lamp from the old Aladdin Hotel and Casino. If you collect casino chips, I'm sure you will find these casino neon signs interesting. They have more scheduled to be restored.
They have also restored numerous other non-casino neon signs. All of their restored signs can be viewed in Downtown, Las Vegas in various locations along the Fremont Street Experience.
They keep the signs they acquire in a location called the "Boneyard" where they wait to be restored. Groups of 10 or more can arrange a tour of the Boneyard for $5 each. It's a tour that you should arrange if you have the time when you are here in Las Vegas. The details on the tour, plus more information on what they do, and pictures of their work are on their Web site linked below.
http://www.neonmuseum.org