In Gifu Prefecture, Japan, there is an unusual solar building called the Solar Ark, built by Sanyo. It’s one of the most impressive solar buildings in the world. Passengers on high-speed bullet trains can’t help but notice the edifice as they ride past on a nearby railway line. The building was built to symbolize the goal of becoming a “clean energy society” and it houses a solar museum inside. The Ark incorporates 5,046 solar panels, and produces about 630 kW of power, which means 530,000 kWh of clean energy is produced annually by the structure.