Walking inside Kyoto Nijo Castle today people may hear a soft chirp reverberate along ancient corridors even though the sound is not from actual birds but the product of a 400 year old security system known as Nightingale floors or uguisu bari These ingenious creations from the Edo period use hidden nails beneath the floorboards that rub against metal clamps with each step to alert guards of any unwelcome intruder While popular lore speaks of ninjas many intruders were deterred from the start an

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Trakai Castle, a medieval red brick fortress, is located on an island in Lake Galvė in Lithuania. It is one of the country's most iconic tourist destinations. Construction of the stone castle was begun in the 14th century by Grand Duke Kęstutis, and the main works were completed around 1409 by his son, Vytautas the Great. The castle was an important strategic center and the residence of the Grand Dukes of Lithuania. After the Battle of Grunwald in 1410, it lost its defensive importance and becam

9.6K views · 291 reactions | Trakai Castle (Trakai Island Castle) in Lithuania, the only castle in Eastern Europe built on an island. | Walter Kavaliauskas | Facebook

46K views · 1.1K reactions | Trakai Island Castle, an iconic medieval fortress located on an island in Lake Galvė, near Vilnius, Lithuania. | Walter Kavaliauskas | Facebook