The Pool at Adelphi Hotel

"The pool has a glass bottom, so you can watch pedestrians below as you float"

"This small and groovy luxury hotel is known for both its innovative architecture (especially the glass-bottomed rooftop swimming pool, which partially overhangs the street below) and its classy restaurant in the hotel basement"

") And that suspended rooftop pool, eight storeys up? It’s still open in all its glory, overlooked by the penthouse cocktail bar, Mon Bijou"

"The pièce de résistance is the top-floor, 80-foot lap pool, which has a glass bottom jutting out from the edge of the building: bathers literally swim into space"

"Revamped in 2014, it is now also the world’s first dessert-themed slumber spot, where bowls of candy mix with striking Deco shapes, a cantilevered swimming pool and killer address in the heart of the city"