Most expensive house (we could get into): Greenwich Village

At $50 million, the cost of this spa-like palace may take your breath away, but remember that the air in this place is super-purified.

This penthouse stunner in Manhattan's Greenwich Village neighborhood makes sure its owners are healthy as well as wealthy. Marketed as "wellness real estate," this duplex is in a building that features not only high-end finishes, but perks aimed at boosting one's health like vitamin C-infused showers, purified water, posture-support flooring and circadian lighting.

The purchase of this megahome also grants you access to sleep, stress management and nutrition programs through the Cleveland Clinic and access to a wellness concierge. And you'll want to get to know your neighbors—health guru Deepak Chopra and actor Leonardo DiCaprio have purchased apartments in the building.

And the duplex looks good too. A hand-crafted metal staircase joins its two stories of living space with 2,200 feet of outdoor space. There are four bedrooms, 4½ bathrooms and more than 7,600 square feet of interior space.

The chef's kitchen includes a herbarium, while the master suite features a whirlpool with chromatherapy, which, according to the building's website "utilizes colored light to harmonize with the body's natural energy meridians."

Take a peek inside the most expensive house we were able to get into by watching the video. To read the property's full listing, click here.

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