https://apnews.com/bed3de31159d8a0fbf5a9b5dfca3cd81

KESTER, Belgium (AP) — To a few of the locals, the top-secret, fenced-off installation on the hill is known as “the radar station.” Some folks claim to have seen mysterious Russians in the area. Over the years, rumors have swirled that it might be a base for U.S. nuclear warheads.

It’s easy to see how the rumors start. The site is visually striking. Four huge white Kevlar balls sit like giant spherical spacecraft in a compound in the middle of open farm country 25 kilometers (16 miles) west of Belgium's capital, Brussels.