The Milhous Museum is the private collection of brothers Bob and Paul Milhous.
Every square inch of their Boca Raton venue is adorned with unique and rare objects. The downstairs portion boasts a stately 46-foot custom carousel as its centerpiece, complete with a Wurlitzer 153 band organ.
It's flanked by one-of-a-kind cars like the 1932 Marmon Sixteen Convertible.
Slideshow: Private Milhous collection Watch: Bob Milhous' favorite collectible Watch: Paul Milhous' favorite collectible
The burgundy luxury sedan with whitewall tires and large chrome grill has its original engine and is one of the few surviving cars of its kind. Just one of eleven.
In the late 20's, early 30's, its engine was called "magnificent" and when Howard Marmon unveiled it at the Chicago Auto Salon the Society of Automotive Engineers gave it a medal for outstanding achievement.
But, this was happening during The Great Depression which meant buyers for the luxury automobile were becoming harder to find. Marmon quickly fell into receivership.
Another eye-catching piece is the Gavioli 110-Key Fairground Organ. According to the Milhous Collection catalogue the French organ builder was "the largest and most successful". The colorful and ornate facade includes dancing couples, cherubs, golf-leafed griffins and a bandleader.
Watch and Listen: 1922 Theater Organ plays "New York, New York,"
The Gaudin 125-Key Dance Organ soars into the second story from the ground floor. A fourth-generation organ expert helped the Milhous brothers restore it to its original grandeur. Johnny Verbeeck's Belgium staff replicated parts when necessary and extended the musical scale to include a massive bronze carillon bell weighing 600 pounds. There are four 9-foot tall gold statues and elaborate detailing.
More than 500 items in total will be auctioned off. Each with their own story to tell, their own place in history.
All the items can be found in a catalogue created by RM Auctions in association with Sotheby's. The auction catalogue looks and reads like an art book with captions explaining the item's history running alongside photographs.
The public has never been allowed into the Milhous Museum. The brothers offered their private location as a venue for charities since 1996.
As far as private collections go theirs is considered one of the best. It is not just due to the extraordinary handpicked items from around the world but their interesting and pleasing arrangement and showcasing.
For the first time the public will get a chance to view these rare objects and unprecedented collection of musical instruments. It will also be the only time the public will see them all in the same place.
After collecting for more than 50 years the Milhous brothers have decided it is time to end. With estate planning on their minds the men from Indiana say they are finally ready for someone else to buy and enjoy the items that have brought them so much pleasure.
Everything is for sale. Your ticket in for the public viewing is Wednesday and Thursday. To enter you must buy a catalogue for $120 which covers admission for two. Registered bidders will be allowed into the auction on Friday and Saturday.
Buyers are expected from all over the World.
To view a digital catalogue and learn more about "one of the world's most admired" collections, visit the RM AUCTIONS | Classic Car Auctions Company website.