The castle was probably four towers. Only round tower Kotnov with attached Bechyňská gate preserved.
Kotnov tower is the dominant landmark of the former castle, which was burnt down in 1532. From 1612 to 1613, a brewery was built on its remnants; it was going through structural modifications until the 20th century. The castle "Hradiště" was established as part of the whole system in 2nd half of the 13th century during the reign of Přemysl Otakar II., probably by Vítek of Hradiště, the son of Vítek of Prčice, the famous founder of the Vítkovci family. Next to the tower, there is the only preserved town gate, called Bechyňská. Unlike the tower, the gate has been preserved in almost original condition of the High Gothic period.
The round, medieval Kotnov Tower is the most significant remainder of the Kotnov Castle from the 13th century. Be sure to climb up to get a wonderful view of old and new Tábor and the river Lužnice. The climb is "at your own risk" (roughly 70 steep wooden steps with sturdy handrails) but we can testify that it can be done wearing slip-ons and carrying a small dog in one arm.