Barcelo, Spain, Casa Batllo (World Heritage Site) - One of 2 houses by Gaudí in Barcelona that can be toured. truly amazing and worth the visit. go in the mornings, before the site gets crowded with architecture students.
Golden Gate Bridge, San Francisco/Oakland, CA. My dad sailed home from WWII after 4 years in the So. Pacific & said that the Golden Gate Bridge again was one of the most beautiful things he'd ever seen.