Arecibo, Puerto Rico, a little over an hour drive west of San Juan on Route 22, is home to the world's largest radar telescope and an astronomical research center managed in part by Cornell University. An interactive visitors center connects to the outdoor deck where you can see the telescope dangling over a giant sinkhole. (You may recognize the complex from the movie Contact, starring Jodie Foster.) The facility, located on Route 625, is open daily except most holidays. Phone 787-878-2612.

Note: Puerto Rico sustained severe damage during Hurricane Maria in September 2017. Recovery efforts may take years. Travelers should investigate current conditions prior to planning a visit.

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