The Basel Cathedral or Basler Münster has been accumulating history for the better part of two millennia.

A Roman fort occupied the site in 15 BC, a church followed in the 800s, and the cathedral, consecrated by King Heinrich II in 1019, was built from red sandstone hauled from the Black Forest by ox-cart. Much of it was rebuilt after Basel's catastrophic 1356 earthquake, yet the Romanesque bones survived.

The two towers, named for St George and St Martin, each tell a story in stone: George spearing a small dragon, Martin slicing his cloak for a beggar. The crypt holds graves from 1000 AD, Erasmus of Rotterdam's tomb sits on the main floor, and behind the altar rests the only queen buried anywhere in Switzerland.

VoiceMap's self-guided audio tour traces the cathedral's layered past, from Roman garrison to Protestant Reformation, then follows its cloister to uncover a quietly devastating environmental catastrophe memorialised there in stone.