6 Sights in Madison County, United States (with Map and Images)

The Pinson Mounds comprise a prehistoric Native American complex located in Madison County, Tennessee, in the region that is known as the Eastern Woodlands. The complex, which includes 17 mounds, an earthen geometric enclosure, and numerous habitation areas, was most likely built during the Middle Woodland period. The complex is the largest group of Middle Woodland mounds in the United States. Sauls' Mound, at 72 feet (22 m), is the second-highest surviving mound in the United States.

Wikipedia: Pinson Mounds (EN)

The Redstone Test Stand or Interim Test Stand was used to develop and test fire the Redstone missile, Jupiter-C sounding rocket, Juno I launch vehicle and Mercury-Redstone launch vehicle. It was declared an Alabama Historic Civil Engineering Landmark in 1979 and a National Historic Landmark in 1985. It is located at NASA's George C. Marshall Space Flight Center (MSFC) in Huntsville, Alabama on the Redstone Arsenal, designated Building 4665. The Redstone missile was the first missile to detonate a nuclear weapon. Jupiter-C launched to test components for the Jupiter missile. Juno I put the first American satellite Explorer 1 into orbit. Mercury Redstone carried the first American astronaut Alan Shepard into space. The Redstone earned the name "Old Reliable" because of this facility and the improvements it made possible.

Wikipedia: Redstone Test Stand (EN)

Saturn V dynamic test stand, also known as dynamic structural test facility, at the George C. Marshall Space Flight Center in Huntsville, Alabama is the test stand used for testing of the Saturn V rocket and the Space Shuttle prior to the vehicles' first flights. Designated building 4550, it stands 363 feet (111 m) tall and is 98 feet (30 m) square. Its central bay has maximum dimensions of 74 by 74 feet, and it is topped by a derrick capable of moving 200-ton objects in a 70-foot (21 m) radius. An elevator provides access to 15 levels in the structure, and a cable tunnel connects the building to control facilities in the space center's East Test Area.

Wikipedia: Saturn V dynamic test stand (EN)

The Ririe A Pegram Truss Railroad Bridge is a Pegram truss railroad bridge which crosses the Snake River 3 miles (4.8 km) north of Ririe, Idaho. The bridge, which carries a one-track section of the East Belt Branch, consists of two truss spans and is 420 feet (130 m) long by 18 feet (5.5 m) wide. The bridge was originally constructed for a crossing in Nyssa, Oregon in 1894 for the Union Pacific Railroad and was relocated to its current site in 1914, where it carried Oregon Short Line Railroad tracks. The bridge's Pegram truss design was the work of George H. Pegram, the chief engineer for Union Pacific; as Pegram held a patent on the design, all surviving Pegram truss bridges were commissioned during Pegram's tenure with the Union Pacific and Missouri Pacific railroads.

Wikipedia: Ririe A Pegram Truss Railroad Bridge (EN)

The Virginia City Historic District is a National Historic Landmark District encompassing Virginia City, Montana, United States. Designated in 1966, the district includes over two hundred nineteenth-century buildings, representing the site of a major gold strike and the capital of Montana for ten years.

Wikipedia: Virginia City Historic District (Virginia City, Montana) (EN)

The Hogback Covered Bridge is a historic covered bridge near Winterset, Iowa. Named after a nearby limestone ridge, it was built in 1884 by Harvey P. Jones and George K. Foster over the North River on Douglas Township Road. The 106-foot-long (32 m) bridge was designed with a Town lattice truss system. It was built with steel pylons to support the main span.

Wikipedia: Hogback Covered Bridge (EN)