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  1. Hideaway (U.S. Senate) - Wikipedia

  2. The Subway Beneath the US Capitol in Washington D.C.

  3. The Underground Tunnels Beneath the U.S Capitol and Library …

  4. Capitol Discovery | Smithsonian

  5. The Symbolism Behind The Capitol Building's Architecture - NPR

  6. An A-mazing Guide - The Hill

  7. United States Capitol subway system - Wikipedia

  8. U.S. Capitol Building - Architect of the Capitol