The FAA defines the airspace where drones are allowed to fly and generally, as long as they are not within 5 miles of an airport, they can be flown up to 400 feet above the ground and even up to 400 feet above a structure. So if you're not next to an airport, the FAA allows flying next to a skyscraper.
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For the most part, compliance with the 400-foot rule is a voluntary matter. There is no existing mechanism for the FAA to monitor if there are drone pilots, licensed or otherwise, who will fly above this altitude limit.
Can airports detect drones? Typically, Air Traffic Control towers and most airports will not be able to see your drone on radar. Specially tuned drone radar systems can detect drones, but they are generally different from the radar systems used at airports.
Special Travel Considerations for ForeignersWhether you plan to fly for fun or for work, you must register your drone with the FAA using the FAADroneZone portal. If you plan to fly your drone for recreation in the U.S., you must take The Recreational UAS Safety Test (TRUST) required by the FAA.