Mongolia's missing millions: What happened to a decadelong mining boom

ULAANBAATAR -- Located just steps from downtown London landmarks like Harrods department store and Hyde Park, The Knightsbridge Apartments, a luxury residential building in the eponymous upscale central London neighborhood, advertises itself as "private homes enjoying levels of service and facilities to rival any five-star hotel."

Boasting white limestone floors, hardwood timber features, a pool, spa and a feng shui garden, two-bedroom flats sell for between $4 million and $8 million, according to London estate agents. Residents, meanwhile, like their privacy. Many of the residences are owned by corporations aimed at camouflaging the ultimate owner.