Dorotin altán, Empire-style gazebo in Karlovy Vary, Czech Republic.

Dorotin altán is an octagonal wooden gazebo on a granite spur above the Teplá River, built in 1791 by master carpenter Franz Knoll. Eight Ionic columns on an octagonal plan carry a circular dome, originally red and now covered in copper sheet. It is considered the oldest spa park structure in Karlovy Vary.

Count Christian Philipp Clam-Gallas had the gazebo built in 1791 as a gift for Duchess Dorothea of Courland, who first came to Karlovy Vary in 1790 and gave her name to the meadows below. The carpenter and builder Franz Knoll of the Knoll family carried out the work. In the 1970s Prague restorers renovated it, and in 2007 metal thieves stripped most of the copper sheeting from the dome, damaging the wooden structure; it was then given a temporary repair.

The gazebo takes its name from Duchess Dorothea of Courland, who in 1790 held a grand breakfast on the meadow below, which was then called Dorothea's Meadows. The rock beneath the structure bears an inscription from 1791, and a ceramic vase once stood inside with the Greek name "Dorothea" and a wish that past times might become future ones.

The gazebo stands on a granite spur above the Teplá, between the Grandhotel Pupp and the Art Gallery, on the southern edge of Karlovy Vary. It is reached on foot along the riverside paths from the spa centre; the rock below is uneven, so sturdy shoes help. The structure is a protected monument, so the wooden floor and columns are best left untouched.

The stoneware vase that once stood in the gazebo was wrapped by a snake, a symbol of eternity. A marble tablet in its centre bore the name "Dorothea" in gold Greek letters, with the wish: "Ah! If only past times could become times to come!"