Romania offers many natural and historic holiday destinations. The Danube Delta is the largest and best preserved river delta in Europe, known for its unique plant and animal species. Mamaia is Romania's most popular Black Sea resort, located on a long white sand beach. Bucharest is the largest city and serves as the cultural, industrial, and financial center, with elegant architecture earning it the nickname "Little Paris." Famous historic sites include Bran Castle, the Black Church in Brasov, and the painted monasteries of Bucovina. The Transfagarasan road crosses the Fagaras Mountains at high altitudes, providing beautiful scenery.