10. The Biltmore Hotel – Coral Gables, Florida, USA
This historic gem once hosted Hollywood stars and European royalty. Its grand pool, the largest in the U.S. when it was built, sits beneath towering palms and Mediterranean-style columns. Today, the Biltmore’s charm endures, offering an elegant mix of nostalgia and glamor with every swim. It’s timeless luxury that never goes out of style.