In 145, Hardegg was first mentioned in a certificate from Elisabeth von Schleunz, and “Otto de Hardeck” is cited as a witness to the donation. But before that there was …
Relatively well-preserved castle ruins. Definitely worth a detour if you are hiking through the Kajatal from the Thaya up towards Merkersdorf. It is not always open though.
The original Althof Castle in the northwest corner of the city fortifications of Retz was destroyed by the Hussites (Taborites) in 1425/1427. In the southeast corner of the city fortifications …