"The Valley of Square Trees" in Panama has uniquely square-trunked trees, which are a species of the Malvaceae family called Quararibea asterolepis. They are naturally occurring.

These trees feature straight edges and distinct corners on their lower trunks and tree rings. Scientists from the University of Florida have attempted to grow saplings elsewhere, but the trees only retain this rare, right-angled shape in the specific volcanic soil of El Valle.
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In 1785, the Diamond Necklace Affair became one of the biggest scandals in French royal history. Although Queen Marie Antoinette had no involvement, she was falsely accused of secretly obtaining an extraordinarily expensive diamond necklace through deception. The scandal destroyed much of her public reputation, fueled anti-monarchy sentiment, and became one of the events that weakened trust in the French monarchy before the French Revolution.
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Only about 30 locations worldwide feature singing dunes, primarily crescent-shaped barchans, found in deserts like the Gobi, Mojave, and Taklamakan. These dunes produce deep hums or musical notes when sand avalanches slide down their slopes. The sound happens as grains of sand rub together, creating vibrations amplified by the dune’s structure, much like a violin or cello. The sand must be dry, with grains that are uniform in size and spherical, allowing for optimal vibration transfer. Acting like a natural instrument, the dune resonates and amplifies the sound, which can be heard up to 10 km away. This unique phenomenon can last for minutes, depending on the dune. Not all dunes sing, as specific conditions—like dry sand and the right grain size—are required for the sound.
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