The Cuknštejn fortress with the original appearance has been preserved up till present about 3 km south-west of the town Nové Hrady. It is one of the best preserved sights of this type in South Bohemia. The fortress is situated in the eastern part of Terčino Údolí park (Theresa's Valley), 552 m a.s.l.

It was built at the end of the 15th century and at the beginning of the 17th century it was reconstructed in the Renaissance style.
Its small courtyard is enclosed among the residential buildings with a dominant octagonal tower in the corner. Originally a moat (filled now) spanned with a timber drawbridge skirted the fortress. The building presents a link between typical castles and fortresses to the new comfortable residences - manors.
A lot of owners changed there through time and in the first quarter of the 17th century the fortress was annexed to the domain of the castle town Nové Hrady of the Buquoy family.

Cuknštejn can be found on the red marked trail leading through the Terčino Údolí park (Theresa's Valley - about 3.5 km from its central gate and 2 km from the village Horní Stropnice) or on the unmarked fieldpath about 0.5 km far from the small village Světví.
The instruction trail Terčino Údolí (Theresa's Valley) leads along the fortress.