14. The Heliotrope
Ralph Dish, a visionary German architect, dared to create a home that not only saves the planet but also embodies cutting-edge eco-friendly living. The Heliotrope, built in Freiburg, Germany, in 1994, is a cylindrical, solar-powered masterpiece that rotates to maximize its exposure to the sun.
This energy-efficient house utilizes super efficient insulating materials, solar thermal railings, and state-of-the-art purification systems for recycling and composting waste. The Heliotrope produces surplus energy, making it the world’s first energy-positive solar home and a shining beacon of sustainable living.
