Secret towns known to the super-rich

Ronkonkoma, N.Y.
Who visits: Super-rich jet-setters
Population: 19,082

When the super-rich want to customize their private jets, one of the designers they turn to is Eric Roth at International Jet Interiors in Ronkonkoma, N.Y. Some of the wealthiest celebrities and CEOs in the country have been there in their private jets.

Want to put gold on every fixture in the aircraft? Looking for a toilet seat covered in alligator skin? Roth can make it happen.

"We had one client who was a producer and he said, 'I'm going to go from coast to coast, and what I want to do is be able to edit my films on the fly,' " Roth said. "And that's exactly what we did."

The movie theater in the sky cost about $1 million, but that's really no big deal considering the tens of millions spent just to buy the plane.

Amelia Island, Fla.
Who visits: Super-rich car collectors
Population: 11,705

For most of us, shopping for a new car means heading down to the local dealership, but that obviously won't work for the super-rich.

Some of the most expensive cars on the planet are sold at auctions, and the show that kicks off the season for well-heeled collectors is in Amelia Island. On one weekend in March, this small beach community off the coast of North Florida can make the Hamptons feel cheap.

One collector spent more than $4.5 million this year for a 1935 Duesenberg Model SJ Walker. When the dust finally settled from the car-buying frenzy, collectors had spent more than $26.8 million at the RM Auctions event and more than $28.1 million at the Gooding & Co. auction, bringing this year's total sales to nearly $55 million for the weekend.

Neenah, Wis.
Who visits: Super-rich Ferrari lovers
Population: 25,504

When super-rich car collectors want to have their classic Ferraris restored, one of their first calls is to Wayne Obry in Neenah, Wis. Billionaires are lining up to visit this rural town. Obry said his garage, Motion Products, has an 18-month waiting list, and no amount of money can get your car to the front of the line.

"Just because you have a couple of bucks, you can influence what we're doing? You can change the commitments I've made to my other billionaire customers? Doesn't happen," Obry said.

His work is so good that clients don't mind the wait. A 1953 Ferrari 340/375 MM that Obry restored recently sold at auction for nearly $13 million.

Secret location in Kansas
Who visits: Super-rich and paranoid
Population: About 5,000

Regular folk might not be able to survive a sharknado, but the super-rich sure can. If it does start drizzling great whites, some wealthy preppers will be bunkered in $3 million condos in an undisclosed spot in the middle of the country.

Builder Larry Hall is putting up 11 units in a decommissioned missile silo that he said is bombproof. Though CNBC got to tour these luxe end-of-times bunkers, Hall asked that we not reveal their location for security reasons.

Hall said the compound will come complete with a pharmacy, pet park, video game center and pool. There's even a jail cell if one of the cooped-up, well-heeled residents needs a time-out.

The renovation isn't even finished, but Hall says all the units are sold out. So, if you want in, better jump on the waiting list for the No. 2 silo, which is in development.

Alpine, N.J.
Who visits: Super-rich homebuyers
Population: 1,849

Don't let this "Jersey" town fool you. There are no Snookis or Pauly D's fist-pumping in 07620, one of the richest ZIP codes in the country, according to Forbes. The median home price is about $5.7 million, but one megamansion in this elite Manhattan suburb makes a few million dollars look like a steal.

Stone Mansion, a 42-room, 30,000 square-foot estate, is for sale for $49 million. The house takes an hour to tour, and its amenities are too numerous to list, but the highlights would be the movie theater, 4,000-bottle wine cellar, 65-foot outdoor pool and a ballroom trimmed in 18-karat gold.

Click here to see more secret towns known to the super-rich on CNBC.com.

Related on CNBC.com:

• Secret Lives of the Super-Rich
• Battle of the Smart Homes
• Million-Dollar Minute