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9. Casa do Penedo, Portugal
Tucked away in northern Portugal, Casa do Penedo (The Stone House) looks like something straight out of a fairytale. Built between 1972 and 1974, this home was crafted using four giant boulders. Originally a vacation house, today it’s a tourist attraction and museum. Interestingly, even though it’s near a wind farm, it has no electricity, offering a truly off-grid experience.