Location: Arecibo Observatory, Puerto Rico
Reason to visit: World's largest radio telescope
The Arecibo Observatory sits in Puerto Rico and is operated by Cornell University. This 300m radio telescope is the largest of its kind in the world, and now contributes findings towards the Search for Extra-Terrestrial Intelligence project, more commonly known as SETI.
The Arecibo telescope is built inside a naturally formed sinkhole in the Puerto Rican landscape. Space geeks should consider this one of the most important landmarks in the world to visit, not only for its sheer size, but also because of how fun it is to slide down (see GoldenEye for more details).
Further Reading: here
Google Earth link: here
Google Maps link: here
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