City Escapes: The Danube

It’s the Seegrotte, a former gypsum mine near Vienna that flooded in 1912 and is now billed as the largest underground lake in Europe, with boat rides across its still, emerald-green water.

It’s one of the largest and best-preserved medieval fortresses in Europe, built from 1077 and expanded steadily over the following centuries, and despite its size, it was never actually taken by force in battle. It sits directly above Salzburg’s old town, reachable by funicular, and its scale alone, spread across tens of thousands of square metres, makes it a genuinely different kind of stop from the smaller town squares elsewhere on this cruise.

The Habsburgs built it in the early 1850s after crushing the 1848–49 Hungarian revolution, positioned to face the city rather than away from it, making its purpose control rather than defence. The Liberty Statue standing beside it today was erected in 1947 to mark Hungary’s liberation from Nazi occupation, and unlike most monuments from that era, it survived the fall of communism largely unchanged, even as its official meaning shifted over the decades since.

The waltz is about as closely tied to Vienna as any tradition gets, popularised across Europe in the early 19th century partly through the Congress of Vienna in 1814–15, when the city’s ballrooms became almost as important as its negotiating tables. Composers like Johann Strauss II later cemented the connection, and the tradition is still very much alive today through Vienna’s famous ball season, so a lesson here is less a novelty add-on than a genuine piece of local culture.

**What’s inside Red Bull Hangar-7, the alternative to Hohensalzburg Fortress in Salzburg?**

It’s a striking glass-and-steel dome at Salzburg Airport, built for Red Bull founder Dietrich Mateschitz and opened in 2003, housing his personal collection of historic aircraft known as the Flying Bulls. Everything on display, from WWII-era fighters to a Douglas DC-6, is kept fully airworthy rather than sitting as static museum pieces, and the collection sits alongside a rotation of championship-winning Red Bull Racing Formula 1 cars.

It’s a striking glass-and-steel dome at Salzburg Airport, built for Red Bull founder Dietrich Mateschitz and opened in 2003, housing his personal collection of historic aircraft known as the Flying Bulls. Everything on display, from WWII-era fighters to a Douglas DC-6, is kept fully airworthy rather than sitting as static museum pieces, and the collection sits alongside a rotation of championship-winning Red Bull Racing Formula 1 cars.