A UNIQUE HOME in the affluent community of Scottsdale, Arizona, is up for sale.

Sixty percent of the structure is made from huge boulders.

The walls, floors, and ceilings alternate between stucco and rock, creating an extremely earthy feel as well as an interesting floorplan.

The home is so different that author and former CEO of Neiman Marcus Stanley Marcus once called it ”the most original home in America.”

Estately lists the asking price at $4.2 million.

No this isn't just a random rocky outcrop ...

It's actually a house, built right into huge boulders.

The home uses a combination of stucco and boulders to mark its walls and boundaries.

Sixty percent of the structure is made from rock. It's been featured in over 30 publications, books and international TV shows.

The ancient engravings chiseled into the rocks that make up the home's exterior have earned it a place on the National Register of Historic Places.

The stucco has clear Adobe influences. According to the listing, the home was called "the most original home in America" by author Stanley Marcus.

The front door is wedged between boulder and stucco.

Inside, the rock faces and stucco walls give the home an earthy vibe.

There's no wallpapering these rock walls.

Many of the home's halls and corridors are rather dark because of an apparent lack of windows.

Light streaks can be seen through a few skylights.

The lack of direct light is probably a relief from the harsh Arizona sun.

To move through the home, you must shimmy through rock hallways.

A sliding-glass door in the rear gives residents access to the nine acres of Arizona desert the house sits on.

- Dennis Green for Business Insider.

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