Arecibo Observatory Radio Telescope, National Astronomy And Ionosphere Center, Arecibo, Puerto Rico

Opened in 1997, the Ángel Ramos Foundation Visitor Center features interactive exhibits and displays about the operations of the radio telescope, astronomy, and atmospheric science. The center is named after the foundation honoring Ángel Ramos, the owner of El Mundo newspaper and founder of Telemundo, which provided half of the money to build it, with the rest coming from private donations and Cornell University. It is normally open Wednesday-Sunday, with additional opening hours on many holidays and school breaks. The admission fee is $10 for adults and $6 children and seniors.
General information
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.