"The Killers were fairly unknown at that time, but we became friends when we were staying in London at the Columbia, which is sort of a rock 'n roll hotel, three beds to a room, " he said.

BBC: Brandon Flowers

Potash is a soft rock, which is extracted from sedimentary sea beds formed by evaporation of ancient seas, which is mined via conventional shaft mining like gold and silver.

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Whether you pick the deluxe king room with rock spa bath products, iPod docking stations, and pillow-top beds or the 750-square-foot tower suite with separate showers and tubs, panoramic views of Chi-Town, and separate living and sleeping areas, both blend musical memorabilia with a boutique-style contemporary atmosphere.

BBC: Daily deal: Partying in style on the Magnificent Mile