The Union Arch Bridge serves both pedestrian and vehicular traffic.
The Washington Monument is the world's tallest stone structure and obelisk.
The United States Capitol is the meeting place of the United States Congress.
The Bollman Truss Railroad Bridge is a landmark of industrial design and construction.
The Thomas Viaduct is an arched stone railway bridge spanning the Patapsco River between Baltimore County and Howard County.
Philadelphia City Hall is the house of government for the city of Philadelphia, Pennsylvania.
The Statue of Liberty is a colossal neoclassical sculpture on Liberty Island in New York Harbor.
Designed by Reed and Stem and Warren and Wetmore, Grand Central Terminal is an iconic train station known for its striking architecture.