GREAT BARRINGTON, Mass. (AP) – The Searles Castle has towered over this Berkshire town for 120 years, its seven turrets and blue dolomite exterior creating a fortress at the end of Main Street. It has been walled off from the public as a home to the uber-rich and as a private school, and has opened its gates as a conference center and cultural attraction.

Now, the French chateau-style castle is for sale – a $15 million property joining a small niche of the world’s luxury real estate market.

“People who have everything else want to own a castle at least once in their lives,” said Denis Burrus, a sales agent for de Rham Sotheby’s International Realty who sells castles in Switzerland. “It shows that they’ve achieved something in their lives.”

Searles Castle is no run-of-the-mill mansion. It may not have been designed with the original medieval purpose of keeping enemies away from a royal family, but it has all the trappings to make it worthy of Sleeping Beauty.

There isn’t a moat, but the seven-floor castle does have a dungeon that could be used for a friendlier purpose. A restaurant, perhaps. Or even an extensive wine cellar.

On the floors above, 36 fireplaces are scattered among more than 40 rooms – one of which once showcased a pipe organ and served as a mini-concert hall.

Marble is everywhere – rising in columns, carved as mantles and slabbed out on floors.

Balconies and terraces overlook the property’s sprawling 61 acres that include a T-shaped lagoon, tennis courts and a garden temple guarded by two marble sphinx sculptures.

And if the 60,000-square-foot castle seems too overwhelming, it’s just a short walk from the front gate to a busy row of restaurants and shops along Main Street. Think the tax bill is too high? Just cross the street and file a complaint at Town Hall.

European castles often come with a bit more seclusion, located along countrysides and not always so close to the amenities of a main drag. Burrus has been selling castles for the past 15 years in Switzerland, where one or two of the buildings will go on sale each year for as much as $40 million.

The market is more crowded in castle-rich countries like France, where he said buyers now have about 100 properties to choose from. In America, a country not known for its castles, seeing one for sale is extremely rare.

“There aren’t enough castles marketed and sold in the United States that we bother keeping track of them,” said Steve Cook, vice president of public affairs for the National Association of Realtors.

Agents handling the deal for William Raveis Real Estate envision the building being turned into a spa, resort or conference center, making it a good fit with other luxurious getaways that dot the Berkshires.

But Kristine Girardin, a William Raveis representative, wouldn’t rule out the possibility of the castle returning to its roots as a private residence.

“I’ve seen houses on the market in Beverly Hills for $40 million that I think this is far superior to,” she said.

Built in 1888, the castle was commissioned by Mary Hopkins, the widow of railroad tycoon Mark Hopkins.

Hopkins hired noted interior decorator Edward Searles for the project, and a year before it was finished, the two married.

Mary died in 1891, but Edward stayed in the castle until 1902 before spending more of his time in Methuen. After his death in 1920, the building spent the next three decades as a private school for girls. It then changed hands among business owners and an insurance company, serving at different times as a storage area, conference center and cultural attraction.

Since the mid-1980s, it’s been the site of the John Dewey Academy, a private school for troubled teens. The school’s director says he needs to sell the castle for tax reasons, and is looking for a place to relocate.

But the move might be hard for some who fell under the spell of a building meant for fairy tales.

“It’s tough to go home when you spend your whole day working in a castle,” said Michael Gould, who teaches French and Italian at John Dewey. His office is round, a carved-out nook in one of the building’s seven towers.

“You expect to look out the window and see Rapunzel with the hair coming down,” he said.

AP-ES-05-19-07 1322EDT