The Main Street Fairness Act aims to level the playing the field by requiring online retailers to collect and remit the proper tax.

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The museum's main exhibition space is seven stories beneath street level, and incorporates the foundations of the World Trade Center.

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The Main Street Fairness Act being considered by Congress would create a level playing field for both online and traditional brick-and-mortar retailers.

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But even if the goal is to "level the playing field" in favor of Main Street, it won't happen.

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From a broad street-level plaza, a grand staircase leads down to the museum's main entrance, while another connects the plaza with the river.

ECONOMIST: New architecture