It's amazing how strong they can manufacture glass now, so strong that swimming pools can now have sides, bottoms or windows of glass without fear of the water pressure pushing out and shattering the glass. Architects have taken notice and more and more glass walled swimming pools are being designed, allowing views both into and outside of the pools - amazing.
The Equis House by Barclay & Crousse Architecture is one of the most amazing glass walled swimming pools I have come across with its bridge design.
With the panoramic ocean views, from a distance the swimming pool actually looks like part of the ocean. Source
Also keeping its swimming pool firmly on the ground but inside rather than out is this townhouse pool by Revamp.
The townhouse is huge at and the swimming pool is located in the basement, extending out into the backyard zone. Glass brick ceiling tiles let the natural sunlight shine down into the swimming pool and these tiles are of course a 2nd glass walled area to the lap pool. Source
From the basement we go to the roof top of the Jellyfish House by Wiel Arets Architects.
With no view lower down it only made sense to put this swimming pool on the roof of Jellyfish House where its occupants could enjoy views of the Mediterranean. Since the pool extends out over the terrace below, the bottom is fitted with glass panels to let the sun shine through.
The bottom of the Jellyfish swimming pool is not the only place glass panels where incorporated. Source
Back up on a roof again, the glass fronted swimming pool by Aamer Architects is completely exposed but barely seen amid the lush surrounding gardens.
The landscaping continues on the rooftop deck and seems to also grow inside the pool, but that little bit of greenery is actually another glass panel in the floor of the pool. Source
The glass panel in the floor lines up with the courtyard down below. Source
From a distance the glass side of the pool looks like a regular window. Source
Both an indoor and an outdoor pool, the glass end panel of this pool designed by OFTB plays off of the interior architecture, lining up with the pony wall next to it.
Longhi Architects used a glass wall within the Playa Misterio pool as a window to the indoor gym next to it, which just happens to be below the pool terrace above.