Paris, which has made popular museums out of train stations, royal palaces, and modernist tangles of exposed infrastructure, is innovating yet again: The city is putting a museum on the river Seine.

(Digital rendering of Fluctuart; image by Seine Design)
Inside, temporary exhibits will showcase works by French as well as international artists, with a special emphasis on contemporary street art. Head up to the rooftop for brunch, cocktails, or a small concert amid views of the river, the Grand Palais, and other swoon-worthy sights.
Fluctuart opens in May. Admission is free.
And this is just the first entrant in the city's ambitious effort to "Reinvent the Seine" by installing innovative urban spaces along the iconic waterway and its tributaries. Dozens of other projects are also in the works.