Romania's tourism sector had a direct contribution of EUR 5.21 billion to the Gross Domestic Product (GDP) in 2018, slightly higher than in 2017, placing Romania on the 32nd place in the world, ahead of Slovakia and Bulgaria, but behind Greece and the Czech Republic. The total tourism sector's total contribution to Romania's economy, which also takes into account the investments and spending determined by this sector, was some EUR 15.3 billion in 2018, up by 8.4% compared to 2017. In the first three months of the year 2018, there were 3.12 millions of foreign tourists. Compared to the same 3 months of the previous year, arrivals increased by 10.9% and overnight stays in accommodation establishments increased by 7.1%. In the first nine months of the year 2019, there were 10 millions of foreign tourists. Compared to the same 9 months of the previous year, arrivals increased by 10.2%. According to National Tourism Statistics, 15.7 million domestic and foreign tourists stayed in overnight accommodations in 2018. Of these 2.2 million are recorded as foreign tourists. The most visited cities are Bucharest, Constanța, Brașov, Timișoara, Sibiu, Alba-Iulia, Cluj-Napoca, Sighișoara and Iași. Natural touristic attractions include the Danube, the Carpathian Mountains, and the Black Sea. UNESCO World Heritage Sites in Romania Churches of Moldavia – The eight Romanian Orthodox Churches of Moldavia are located in Suceava County, northern Moldavia, (Bukovina) and were built approximately between 1487 and 1583. Dacian Fortresses of the Orăștie Mountains – The six fortresses (Sarmizegetusa Regia, Costești-Cetățuie, Costești-Blidaru, Piatra Roșie, Bănița and Căpâlna) that formed the defensive system of Decebalus were created in the 1st centuries BC and AD as protection against Roman conquest, and played an important role during the Roman-Dacian wars. Historic Centre of Sighișoara – It is an inhabited medieval citadel that was built in the 12th century by Saxon colonists under the Latin name Castrum Sex and it is the birthplace of Vlad III the Impaler also known by the name of Count Dracula. Danube Delta – It is the second largest river delta in Europe and best preserved on the continent. Monastery of Horezu – It was founded in 1690 by Prince Constantin Brâncoveanu in the town of Horezu, Vâlcea County, Wallachia, Romania and it is considered to be a masterpiece of "Brâncovenesc style", known for its architectural purity and balance, the richness of its sculpted detail, its treatment of religious compositions, its