An idyllic spot on the coast of west France’s Loire-Atlantique region, La Baule-Escoublac is home to one of Europe’s longest beaches, La Baule Bay, which some say is among the world’s most beautiful crescents of sand. This enticing region is the setting for Circle House, a six-bedroom, 12,917-sq-ft home that comprises three circular wings. The glass-walled dwelling is notable for its light-filled interiors and modern design. Sun streams into the large, high-ceilinged entrance hall, which leads to six suites, two offices and a cinema lounge, as well as the real highlight of the property—a 4,305-sq-ft indoor pool. Surrounded by floor-to-ceiling windows and a skylight, the pool area features a bar and a relaxation area complete with sauna and steam room. Trees provide the villa with plenty of privacy.