The Beeb's Rupert Wingfield-Hayes gets invited to visit a US$20 million "cottage" in a secluded Moscow suburb, one packed with other such modest dwellings belonging to other plutocrats.
The first signs of the secret city were enormous green fences, at least 20 feet (6 metres) high, and topped off with closed circuit cameras.
Then ahead of us at the end of a long forest flanked road a gap appeared in the fence. As the Maserati approached the gate swung opens and we swept through.
The billionaire's daughter describes this Japanese-style house as her 'shed'Suddenly we plunged out of the forest, and in to a different world. It was a little like a scene from Doctor Who. One minute we were in Russia, the next in Beverly Hills.
On either side of us huge mansions stood in spacious grounds. Some looked vaguely Georgian, others Victorian, one like a Bavarian castle. Vitaly, the BBC driver, turned to me, his face deadpan. "When did we cross the border?" he asked.
Svetlana's "cottage" was a spectacular 3,000 sq m Art Deco pile. How big is that? Big enough for an indoor swimming pool, a cinema, a bowling alley, a ballroom, and the piece de resistance, its own indoor ice rink!
"This is our newest house," Svetlana told me as we walked past a large bronze sphinx in the gardens. "My father's been building it for five years."
She wasn't sure how much it had cost, "probably 20 million," she guessed.
"So how many other houses do you have?" I asked.
"A couple in Moscow, two in the south of France, and one in Corsica," she said, as if it was the most natural thing in the world.
She shops in Paris and Milan, where she flies on one of her father's private jets.
All these toys have not made Svetlana a happy girl.
"I live in a gilded cage," she told me. "I have no friends and no freedom."
I did feel sorry for her, but only a little.
Wingfield-Hayes also notes that Russia has 60 billionaires. They have all achieved that status in the last 15 years, since the collapse of communism. "Today a quarter of Russia's economy is owned by 36 men."
He spoke with an elderly pensioner who lived near Billionaireville and asked her about the neighbours.
"They're all thieves," she said. "All that money is stolen from the people."