What is the "whispering gallery" in the U.S. Capitol?
The half-dome shape of National Statuary Hall produces an acoustical effect whereby, in some spots, a speaker many yards away may be heard more clearly than one closer at hand. The modern-day echoes occur in different locations from those in the 19th century, when the floor and ceiling of the hall were different.

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Car of History Clock
The marble Car of History by Carlo Franzoni (1789-1819) is located above the north door to National Statuary Hall (the Old Hall of the House of Representatives) in the United States Capitol.
House Wing