The recent immigration surge began with the Arab Spring in 2011, though the great numbers didn't start arriving until 2015. Initially the refugees were welcomed but within a year the unexpected large numbers caused a negative backlash. The EU and the 28 individual countries within, were caught without a plan to deal with the number of people arriving at their borders. Europe has had refugees from Africa, Russia and other places for generations. The difference now is the magnitude.
After a year or two of unregulated immigration, Europe now has strict border controls and few refugees are entering. Many are being held in EU funded refugee in Turkey.
The 1951 Refugee Convention, is a United Nations multilateral treaty that defines a legal refuge as one who has a well-founded fear of being persecuted for reasons of race, religion, nationality, membership of a particular social group or political opinion. It sets out the rights of individuals who are granted asylum and the responsibilities of nations that grant asylum.
One point most people miss, is this convention covers political refuges, not economic refuges who emigrate to improve their financial/social situation. For more information on the Refugee Convention, click this link en.wikipedia.org/wiki/Convention_Relating_to_the_Status_of_Refugees
Wurzburg was 90% destroyed by bombing near the end of the second world war. Much has been restored to its previous splendor of Baroque and Rococo architecture. One example is the Residenz, an ornate complex commissioned by the prince-bishop von Schönborn brothers, Johann Philipp Franz and Friedrich Carl. It has nearly 400 rooms. and sits on grounds of many acres. Napoleon proclaimed it the "largest parsonage in Europe". While the structure was heavily damaged during WWII, it has been painstakingly restored to its pre-war form.