Smederevo Fortress is a medieval fortification located in the city of Smederevo, Serbia. It was built between 1428 and 1430 by the Serbian despot Đurađ Branković, and served as the capital of Serbia from 1430 to 1439.

The fortress occupies an area of about 10 hectares and is shaped like a pentagon with five towers and a central keep. It was built as a defense against the Ottoman Turks and is one of the largest fortresses in Europe. The walls of the fortress are up to 25 meters high and 3 meters thick, and it is surrounded by a moat that was once filled with water.

Over the centuries, the fortress was damaged several times by wars and natural disasters. It was partially restored in the 18th century, but fell into disrepair again. In the 20th century, efforts were made to preserve and restore the fortress, and it is now open to visitors.

Today, the fortress is a popular tourist attraction, offering visitors a glimpse into the history of Serbia and the Balkans. It is also a venue for cultural events such as concerts, plays, and exhibitions. The fortress houses a museum that showcases the history of the fortress and the city of Smederevo, as well as artifacts from the medieval period. Visitors can also climb to the top of the towers for panoramic views of the surrounding area.