Among the sights in the vicinity of Pskov are Izborsk, a seat of Rurik's brother in the 9th century and one of the most formidable fortresses of medieval Russia; the Pskov Monastery of the Caves, the oldest continually functioning monastery in Russia (founded in the mid-15th century) and a magnet for pilgrims from all over the country; the 16th-century Krypetsky Monastery; Yelizarov Convent, which used to be a great cultural and literary center of medieval Russia; and Mikhaylovskoye, a family home of Alexander Pushkin where he wrote some of the best known lines in the Russian language. The national poet of Russia is buried in the ancient cloister at the Holy Mountains nearby. Unfortunately, the area presently has only a minimal tourist infrastructure, and the historic core of Pskov requires serious investments to realize its great tourist potential.