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Choate Bridge

Ipswich, MA

The Choate Bridge of Essex County, completed in 1764, is the oldest documented two-span masonry arch bridge in the United States. It presents a unique example of two co-existent...
Cincinnati Observatory

Cincinnati, OH

The oldest professional observatory in the United States
City Plan of Philadelphia

Philadelphia, PA

City Plan of Savannah

Savannah, GA

The Savannah city plan, whose execution began in 1733, is the oldest city plan in the United States to use a repetitive modular grid with mixed residential blocks and multi-...
Cleveland Hopkins Airport

Cleveland, OH

Completed in 1925, this Ohio airport is the first major municipal airport to provide an integrated engineered system of paved landing surfaces, floodlit runways, and a terminal...
Code-Breaking at Bletchley Park during World War II

Milton Keynes, Buckinghamshire

During the Second World War, Bletchley Park was the site of the United Kingdom's main decryption establishment, the Government Code and Cypher School, as well as Station X, a...
Colorado River Aqueduct


The 242-miles Colorado River Aqueduct made the large scale population and economic growth of Southern California possible.
Columbia River Scenic Highway

Cascade Locks, OR

Opened early in the automobile era, this highway was responsible for accelerating the development of the Northwest, while preserving its beauty.
Columbia-Wrightsville Bridge

West Hempfield, PA

When completed in 1930, this was the longest (one-mile) multiple-arch concrete highway bridge in the world.
Colvin Run Mill

Great Falls, VA

A good example of a typical early 19th-century (US) water-powered, Evans-type flour mill, restored into operating condition.
Commercialization and Industrialization of Photovoltaic Cells


Sharp Corporation pioneered the development and commercialization of photovoltaic (PV) cells for applications ranging from satellites to lighthouses to residential uses.
Commonwealth Building Heat Pump

Portland, OR

First large commercial building in the United States to pioneer the use of heat pumps for heating and cooling.
Compact Disc Audio Player


N.V. Philips' Gloeilampenfabrieken demonstrated for the international press a Compact Disc Audio Player, showing that digital optical recording and playback can be used to...
Conwy Suspension Bridge

Conwy, North Wales

A major structure on the strategically important Bangor-to-Chester road, Conwy Suspension Bridge, Telford's most dramatic creation in the gothic style, was built with the...
Conwy Tubular Bridge

Conwy, North Whales

Conwy Tubular Bridge was the first railway bridge in which trains ran through the main girders. It represents a pioneering use of wrought iron for bridges and a major advance in...
Coolspring Power Museum

Coolspring, PA

An impressive variety of internal combustion engines, built primarily between 1890 and 1920 and consisting mainly of stationary engines used in industrial applications.
Cooper Steam Traction Engine Collection

Mount Vernon, OH

Engines from the collection are among the oldest surviving agricultural steam engines, from 1860 to 1883, showing the conversion to mechanized farming.
Cooper-Bessemer Type GMV Integral-Angle Gas Compressor

Mount Vernon, OH

Providing efficient compression energy for natural gas, petrochemical, refinery, and power industries around the world.
Cooperative Fuel Research Engine

Waukesha, WI

Pioneer variable-compression laboratory engine for testing fuels.
Cornell Aeronautical Laboratory (Calspan)

Buffalo, NY

Nearly every military aircraft and space vehicle developed in the United States from the end of World War II until the present day has been tested at this facility, which is now...