Underground mansion

Oliver Wainwright: A new billionaires' craze for building elaborate subterranean extensions is making swiss cheese of London's poshest streets – but at what cost?

Multi-million-dollar homes for the 1 percent are hardly eyebrow-raising — unless they happen to extend stories beneath the earth's surface.

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It is increasingly common to find London properties that have more subterranean interior space than above-ground square footage, a byproduct of the wealthy desiring to build additions without tripping over surface-oriented building codes. New legislation in some boroughs of the city aims to cut down on permits issue to such underground expansions and could provide guidance

Going underground and extending homes downward through the basement seems to be an increasing trend for the rich and famous writes CATHERINE OSTLER.

Two Homes Connected by an Underground Tunnel Are on the Market for $3.1 Million—See Inside

From the Bat Cave to the Playboy Grotto, the allure of the underground lifestyle is buried deep in the human condition. We may once have been cave

Get ready to discover exciting and offbeat home designs that bring a touch of the exotic to modern architecture.

“I found this reference on Pinterest and added the underground part 💚”