This is the largest radio telescope to be constructed on the face of the planet. It was built in 1960’s and has many different roles that it served, and serves to this day. It served as a military spy weapon during the Cold War and it disproved many theories and discovered many new things in space such as the first asteroid captured on an image. Take a look at this engineering marvel.
The Arecibo telescope is enormous; the main collecting dish is 305 m (1,000 ft) in diameter, constructed inside the depression left by a karst sinkhole.
It contains the largest curved focusing dish on Earth, giving Arecibo the largest electromagnetic-wave-gathering capacity. The dish surface is made of 38,778 perforated aluminum panels, each measuring about 3 by 6 feet (1 by 2 m), supported by a mesh of steel cables.