Karlsplatz Stadtbahn Station, Vienna

Otto Wagner-Vienna’s own king of curves and crown prince of steel... When he took charge of the city’s underground system in the 1890s, he didn’t just design train stations-he gave the Viennese public transit a full-blown Art Nouveau glow-up. Enter the twin Karl's Square pavilions, those photogenic little buildings that look like they belong in an opera about trains falling in love...

With their swirling floral motifs, sleek lines, and unapologetically exposed steel framework (because Wagner believed architecture shouldn’t lie), these beauties are equal parts sculpture and structure. They opened to the public in 1899 and promptly became the city’s most stylish way to exit a railway platform.

Fast-forward to the 1980s. The city’s old Stadtbahn line was being updated to the modern U-Bahn, and some genius had the bright idea to demolish Wagner’s pavilions. The Viennese public responded with a collective “absolutely not,” and a full-on preservation revolt followed. As a result, the pavilions were disassembled piece by ornate piece, hoisted up about seven feet, and then reassembled like architectural Lego-Viennese edition.

Today, the twin structures face each other across Karl's Square like two stylish old ladies trading secrets. One is now a delightfully eccentric café (no word on whether the ghost of Wagner sips espresso there); and the other houses a compact exhibit on his life’s work, including a striking model of his magnum opus, the Church at Steinhof.

Local tip:
While you're around Karl's Square, don’t miss Saint Karl's Church, an overachieving Baroque masterpiece with a dome that practically shouts, “Behold me!” You’ll also find the University of Technology, the Vienna City Museum, and the delightfully rebellious Secession Building, famous for its golden cabbage-shaped dome and complete lack of subtlety. And if it's summer, grab a bench under the trees in Resselpark, and let Vienna do the storytelling for you.