The best traffic-free bike rides in Zwettl

After historical decay, the complex was extensively renovated in the 20th century through private initiative and saved from ruin status. As it is privately owned, it can usually only be viewed from the outside.

Between Klosterstraße and Schulturm, the city wall is integrated as an outer wall into the St.Martin retirement home and can be viewed from the adjacent car park. Numerous new breakthroughs will be made during the construction work at the retirement home.

Sometime between 1935 and 1938, the tower gets its current roof; before that, it was known with brick battlements.

The school tower stands at the easternmost corner of the city wall. The tower's floor plan is polygonal (eight sides of different lengths). The tower is four stories high, with a descending floor without windows and three ascending ones. It is placed in front of the existing wall, which can be seen very clearly on the wide inner side and the connection corners. Access to the tower is via an opening in the city wall. On the 2nd upper floor, there is a bricked-up door, which presumably led to the rampart. The defensive tower was formerly called Hafnerturm, due to the neighboring Hafner workshops at Neuer Markt. It gets its current name from the citizens' school founded in 1872, the first in Lower Austria, which is located on the same plot and is now run as a New Middle School for Sport and Economy.

The local authorities succeeded in persuading the master artist Hundertwasser to design and construct a fountain in the main square. The presentation of the fountain model met with both widespread approval and vehement opposition from the residents of Zwettl. In 1994, the fountain, consisting of three main elements—the two fountain columns with basins and the pavilion—was unveiled to the public. Since then, it has been a popular meeting place in the heart of the town. Friedensreich Hundertwasser died in February 2000 at the age of 71.

Until the end of the 19th century, a monumental fountain stood in the middle of the main square, the terminus of Zwettl's oldest water supply system, dating back to the early 17th century; a place where the population gathered, not just to fetch water. A war memorial was erected here in 1925, and from the mid-20th century onward, the square in the heart of the town was primarily used as a park. In the early 1990s, the municipality of Zwettl decided to redesign the main square. The aim was to give the town an attractive central point once again and thus preserve the tradition of the old Zwettl main square for the present and future. Friedensreich Hundertwasser, born Friedrich Stowasser in 1928, had owned an old mill on the banks of the Kamp River above Zwettl since the 1970s.

Originally, after the town's founding, Trinity Square was part of Zwettl's main square, which at that time stretched as an extensive triangular plaza from the townhouses behind the Hundertwasser Fountain to the level of the Hausleitner house above the "Zur Goldenen Rose" inn. The construction of houses along the lower Landstraße, the so-called "Grätzl," significantly narrowed the main square, and the addition of the cross street eventually divided it into two squares.

During the Baroque period, people everywhere were eager to express their gratitude for overcoming the plague years and the Turkish Wars by erecting plague or Trinity columns. In 1727, the pillory in the upper square was replaced by the richly sculpted sandstone column created by Kaspar Högl of Eggenburg. During the last renovation in 1998, extensive environmental damage to the figures was repaired, and the entire column was painted a light yellow. The four life-size statues are, in the center at the front, the Immaculate Conception; to her left, St. Sebastian (pierced by five arrows); to her right, St. Roch (pointing to the plague boil on his thigh); and St. Florian (holding a flag in one hand and a bucket of water in the other). The iron fountain in the immediate vicinity of the Trinity Column is a gift from the then-mayor, Eugen Beck, of the twin town of Plochingen near Stuttgart.