Swallow's Nest is a popular landmark and tourist attraction located near Yalta, Crimea, on the Black Sea coast of Ukraine. The castle is perched on top of a cliff overlooking the sea, offering breathtaking views of the surrounding landscape.

The castle was built in 1912 by a wealthy Russian oil magnate as a vacation home. It was designed by a Russian architect in a Neo-Gothic style, with turrets, battlements, and intricate detailing. The name "Swallow's Nest" comes from the fact that it was built on a rocky outcropping that resembles a swallow's nest.

During World War I, the castle was used as a lookout point for the Black Sea Fleet, and later it was used as a restaurant and a venue for various events. Today, the castle is a popular tourist destination and can be accessed by foot or by boat. Visitors can enjoy stunning views of the sea and the surrounding mountains, as well as explore the castle's interior, which now houses a small museum and a restaurant.