Philadelphia's Shrine to Monetary Policy ; New Exhibition Teaches Public What It Needs to Know about the Federal Reserve

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On July 4, more than 10,000 visitors crammed into the National Constitution Center in Philadelphia, after its nationally televised inaugural ceremony earlier in the day.

Two days earlier, economists, bankers, and monetary-policy wonks gathered at a more low-key opening across the street.

Tucked into the lobby of the fortress-like Federal Reserve Bank, the interactive "Money in Motion" exhibition is now open for business. Although it's just a stone's throw from the Constitution Center, the boutique museum is definitely off the beaten path.

Vivienne Ehret, owner of the Uniquely Philadelphia tours, hadn't caught word of it. "But I'll make note of it," she …