Flémalle-Haute, Belgium, a hidden gem for urban explorers, boasts a plethora of abandoned gems waiting to be discovered. From the eerie, crumbling ruins of the old castle to the forgotten, overgrown cemetery, there's no shortage of untouched treasures to explore. But be warned, these off-the-beaten-path locations are not for the faint of heart, and the thrill of discovery comes with its own set of risks.
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