The Guggenheim mUSEUM is truly a sight to behold, an iconic structure built by Frank Lloyd Wright in 1959 that, at the time, drew a line in the sand between old- and new-school architects.Now a revered city treasure, the Guggenheim houses important works from the 19th and 20th centuries – Picassos, Van Goghs, Chagalls, Kandinskys – and puts on wildly popular exhibits within its spiral hallways.