It is notable for its position on the Diendorf fault line and for its immediate vicinity to the site of one of the most significant Celtic settlements in Central Europe, situated on the southern slopes of the nearby Sandberg ridge towards the neighboring village of Roseldorf.

Systematic archeological excavations that have been ongoing since 2001 continue to reveal information on this recently recognized and highly significant settlement from the Iron Age, which at its climax comprised at least 450 buildings and included a halidom district with several cult sites.

From this time onward the headcount dropped continually, reaching a minimum of 398 in 1991 and rising only marginally as a result of weekend residences being built, mainly by citizens of Vienna which is about 75 kilometres (47 mi) away to the southeast.

Platt is situated on one of the most active segments of the Diendorf fault, a geological disturbance traversing Lower Austria from Wieselburg and Melk to Mautern, Krems and Maissau, then continues northward towards the Czech border.

Platt's economy is essentially agricultural, mostly based on wine, but recently significant areas have been dedicated to pumpkins (the Styrian variety cultivated for their highly valued seed oil) and sunflowers.