Stewards of the iconic buildings and grounds of Capitol Hill since 1793.

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The Old Supreme Court Chamber is the first room constructed for the use of the nation's highest judiciary body and was used by the Court from 1810 until 1860. Built by Benjamin Henry Latrobe, it was a significant architectural achievement, for the size and structure of its vaulted, semicircular ceiling were virtually unprecedented in the United States.
The Old Supreme Court Chamber is the first room constructed for the use of the...

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A crowd of people visiting the Capitol during visitor hours
Visitor Hours for the Buildings on Capitol Hill.

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East Front of the U.S. Capitol Building
AOC’s annual Performance and Accountability Report provides the results of the...

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East Front Plaza Repairs
AOC is making repairs to expansion joints on the East Front Plaza of the...

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A Century of Service

This year, the Capitol Power Plant marks 100 years of steady service of steam and chilled water to heat and cool the Capitol. In that century of service, the plant has undergone significant changes as new buildings were built, and more modern and efficient equipment was installed.

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