In the 13th century the Lords of Osek founded the castle Becov nad Teplou on a cliff over a provincial route for its protection and collecting duties. The castle reached its peak in the late 15th century, when it belonged to the Pluh family of Rabstejn, who were engaged in gold, silver and tin mining. The Pluh family connected two older parts of the castle and later built a new residential palace in the Renaissance style there. In 1547, Kaspar Pluh headed the uprising of the Estates against Ferdinand I, which failed and he was sentenced to death. The Becov dominion continued to serve as a pledge for the debts of the Emperor Chamber.
The Thirty Years' War broghts an end to tin prosperity and in 1648, the Swedish army damaged the castle and occupied it. The most valuable preserved part of the castle is the Chapel of the Visitation of Our Lady from the year 1400 with original frescoes depicting 17 Biblical motives.
In the 18th century, on the site of the former fortifications above the castle moat a Baroque chateau with an octagonal tower was built. The tower housed state rooms, a library and fountains. In the 19th century the castle was connected with the chateau into one complex. The interiors were renovated in the Romantic style by architect Josef Zitek. There are valuable collections of paintings and tapestries from the property of Belgian Beaufort-Spontin family, who bought Becov in 1813.