Castle Hričov is a gothic castle built in 13th century which slowly deteriorated in the 17th century. Located 507 m.a.s.l. it makes for a good moderately challenging hike from Hričovské Podhradie. A red marked trail leads through forests, a meadow and a canal.
Beware, the terrain is slightly rocky and as many old ruins in Slovakia, Hričov Castle too is falling apart and rocks might fall off of the walls.
Wikipedia https://cs.wikipedia.org/wiki/Hričovský_hrad
Address 01341, Slovakia
Coordinates 49°12'42.106" N 18°37'11.904" E