Curious Oslo

Why did the ancient Roman rich and famous choose to vacation here? Who opened the gate for the bad guys in the 1500s? What does the town clock tower symbolize? What's the history of majolica tile art? Why are Sorrento lemons and limoncello so famous?

What did Alfred Nobel invent that led him to create the Nobel Prize? What is Gamla Stan? What's so important about the throne inside the Royal Palace of Stockholm? What is the Djurgarden Canal, and why was it only for the Royal Family? Why did the Swedes grow grass on their rooftops, and what's the history of their folk costumes?

Why did the famous French architect Eugene Viollet-le-Duc only work on one residence: the historic Roquetaillade Castle? Why is there a monolithic church in Saint-Emilion? And why did its monk sleep underground? Why is there a giant wall around the tiny village of Blaye? And why was beautiful Bourg-en-Gironde built into the side of a cliff? And how do Cadillac and Pauillac make time stand still?

How did Dublin get its name? And what do Vikings and a black pool have to do with it? Who was Maewyn Succat, and why is he celebrated with green beer? How did the harp become a symbol of Ireland, and why do the harps on Irish coins and Guinness beer look different? What is the curious history of the Book of Kells, and how did it make its way into Trinity College's Longroom Library?

Who were the Habsburgs, Maria Theresa, Franz Joseph and Sisi? And how did they shape Vienna? What is the Ringstrasse, and why are there so many oversized, ornate public buildings dotting it? Where did Mozart perform as a 6-year-old prodigy? When and why did Austria shrink to a tenth of its size? What do the eagles on the rooftop of St. Stephen's Cathedral symbolize? And why are Vienna's coffee and pastries so legendary?