North of Smolenice is the village Buková with water reservoir and a marked route, which leads southward to the romantic ruins of the Castle Ostrý Kameň from the 13th century. The Castle was a royal border fort guarding the Czech road in the past. It is in decay since the 18th century though part of its walls, bastion, and adjacent buildings are still observable. The top of the Castle provides a nice view of the Malé Karpaty Mts. and the Záhorská nížina lowland.
References:Červená Lhota castle stands at the middle of a lake on a rocky island. Its picturesque Renaissance building is a destination of thousands of tourists every year. Its name Červená Lhota meaning 'red lhota' can be explained by the colour of the château"s bright-red roof tiles. There is also a park, where the Chapel of the Holy Trinity is located.
The existence of an original fortress on the site of today"s château is assumed from sometime around the middle of the 14th century. It was built on a rocky granite outcrop, which, after the damming of a stream and the filling up of a fishpond, became an island. The first written source is an entry into the land records from 1465, mentioning the division of the property of deceased Ctibor of Zásmuk between his two sons Petr and Václav.