The Statue of Liberty is a colossal neoclassical sculpture on Liberty Island in New York Harbor.

The United States Capitol is a monument, a working office building, and one of the most recognizable symbols of representative democracy in the world.

The Mason-Dixon line is a demarcation line separating four U.S. states.

The Washington Monument is the world's tallest stone structure and obelisk.

Designed by Reed and Stem and Warren and Wetmore, Grand Central Terminal is an iconic train station known for its striking architecture.

Philadelphia City Hall is the house of government for the city of Philadelphia, Pennsylvania.

The Thomas Viaduct is an arched stone railway bridge spanning the Patapsco River between Baltimore County and Howard County.

The Bollman Truss Railroad Bridge is a landmark of industrial design and construction.