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

The center was listed on the U.S. National Register of Historic Places in 2008. It was the featured listing in the National Park Service's weekly list of October 3, 2008. The center was named an IEEE Milestone in 2001.
Ángel Ramos Foundation Visitor Center
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.