Vienna architects [You must be registered and logged in to see this link.] have completed an open-air swimming pool in the park of a 17th-century castle in Jöss, Austria.

The project, called Open Air Pool Eybesfeld, incorporates a partially-underground shower area with glass-panelled shelving.

An undulating concrete walkway covered in polyurethane swoops down over the shower room and provides gradual entry to the water.

The pool measures 15.25 by 6.75 metres.

Photos are by [You must be registered and logged in to see this link.].
Here’s some information from Pichler & Traupmann Architekten:
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Open Air Swimming Pool Eybesfeld
The original plan for Eybesfeld Castle was to provide a new base and
an integration into the landscape by a surrounding loop in exposed
concrete.

This loop should comprise living, secondary functions as well as an indoor swimming pool.

This project was split up later on in two single projects: a living
landscape on the ground floor of the castle and a pool area located
outside of the former castle wall near the corner tower in the park: a
spread out blanket in polyester.

Pool, entry- and sunbathing areas, playground, seat ramp and sun
deck are interpreted as zones of one single body lying in the lawn,
coated homogeneously with polyester or polyurethane respectively.

Below ground level where this figure folds up from the lawn emerge
changing cubicles and a shower room arranged as a mere glass structure
underneath the cantilevering concrete structure.

The surfaces of the pool entry and the seat ramp have an undulating
shape in such a way as to achieve anatomically formed seat and lying
hollows.
Project Name: Open Air Pool Eybesfeld, Jöss/Lebring, Austria
Use: Swimming pool (15.25 x 6.75 m)
Client: Christine and Bertrand Conrad-Eybesfeld

Project Team PxT:
Sandra Riess
Wolfgang Windt

Structural Planning:
Manfred Petschnigg, Graz

Landscape Planning:
West 8, Rotterdam

Mechanical/Pool Planning:
PKG Graz
Light Design:
Klaus Pokorny, Vienna

Site Supervision:
Arch. Gerhard Kordon, Graz
Josef Fritz, Graz

Start of Planning: 2003
Start of Construction: 2005
Completion: 2009

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Posted by Sarah Housley from dezeen.com