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Ames Hydroelectric Generating Plant

Ophir, CO

The Ames Hydroelectric Generating Plant was the very first commercial system that allowed for the production and transmittion of Alternating Current electricity.
Antoine-Laurent Lavoisier: The Chemical Revolution


Antoine-Laurent Lavoisier forever changed the practice and concepts of chemistry by forging a new series of laboratory analyses that would bring order to the chaotic centuries of...
Apollo Lunar Module LM-13

East Garden City, NY

First piloted vehicle designed to operate solely in the vacuum of space.
Apollo Space Command Module

Titusville, FL

Apollo command module incorporating many innovations to allow safe transport of humans to moon and back.
Armour-Swift-Burlington Bridge

Kansas City, MO

This unique, telescoping vertical-lift, steel-truss bridge spanning the Missouri River at Kansas City since 1912 is representative of the innovative moveable bridges designed by...
Arnold AFB Wind Tunnel

Arnold AFB, TN

Arroyo Seco Parkway

Los Angelos, CA

This 6.7-mile parkway was the first freeway to be built as a state highway in the United States and is the first freeway west of the Mississippi.
Ascutney Mill Dam

Windsor, VT

Built in 1834 and still in service today, this is among the very earliest masonry dams of significant size. Made of granite and measuring 120 ft long with a crest 42 ft above...
ASME Boiler and Pressure Vessel Code

Dearborn, MI

The first comprehensive standard for the design, construction, inspection, and testing of boilers and pressure vessels, greatly influencing public safety.
Atanasoff-Berry Computer

Ames, IA

The Atanasoff–Berry Computer is recognized as the first electronic digital computing machine in the world.
Atanasoff-Berry Computer (DUPE: CEA+IEEE)

Ames, IA

The Atanasoff–Berry Computer is recognized as the first electronic digital computing machine in the world.
Atlantic City Convention Hall

Atlantic City, NJ

When completed in 1929, this hall was the world's largest auditorium and the greatest permanent span three-hinged roof arch system ever built. Now known as Boardwalk Hall,...
Atlas Launch Vehicle

El Cajon, CA

First launch vehicle for the US space program.
Bailey Island Bridge

Harpswell, ME

Completed in 1928, the Bailey Island Bridge traverses an 1,150-foot stretch of high tidal water with swift currents, severe saltwater exposure, and heavy winter ice floes.
Baltimore & Ohio Roundhouse & Shop Complex

Martinsburg, WV

The Baltimore & Ohio Railroad Roundhouse and Shop Complex contains some of the most significant surviving mid-nineteenth century structures in the United States. The complex...
Basic-Oxygen Steel Making Vessel

Trenton, MI

Vessel that introduced the basic oxygen process to the United States.
Bay City Walking Dredge

Naples, FL

The last remaining dredge in the United States with unique propulsion system, designed for a wetlands environment.
Bayonne Bridge

Staten Island, NY

Completed in 1931, this steel arch bridge, designed principally by Othmar Ammann, was the greatest span (1,675 feet) of its type in the world and remained so until the New River...
Belle Fourche Dam

Belle Fourche, SD

This was the largest homogeneous rolled-earth fill dam in the world when completed in 1911. The project's engineers developed many of the quality standards that became the...
Belle Isle Gas Turbine

Schenectady, NY

The first gas turbine used for electric utility power generation in the United States.