Image by Carlos Amarillo Shutterstock
The sci-fi stylings of 'UFO bridge' came at a heavy cost for Bratislava. Period mansions and an old synagogue were sacrificed for the construction of the highway and bridge in 1972, so the sight of this modernist marvel with a flying saucer on top is bittersweet for locals. Nonetheless, the bridge's pedestrian walkway is a futuristic route across the Danube River, and there's a (pricey) viewing platform with a bird's-eye panorama.
The viewing platform is free if you eat in the restaurant within the UFO (be warned, it's expensive).