Romania
Read MoreOne of the most visited sites in Romania, the Peles Castle served as the summer retreat for the Romanian monarchy until 1945. After the Communist regime seized all royal property, the castle was converted into a museum and opened to the public in 1953. 22 years later, in 1975, Nicolae Ceausescu decided to close the castle entirely, and it would remain closed all the way until 1990, after the 1989 Romanian Revolution.
The Lutheran Cathedral of Saint Mary in Sibiu, Romania
Even though construction on the cathedral started in the 14th century, on the ground of an older 12th century church, it was fully completed only in 1520. The cathedral currently hosts the largest musical organ in southeastern Europe.