The Kreisviadukt Brusio, or Brusio Circular Viaduct, is a stunning single-track railway viaduct on the Bernina Line in Switzerland, a UNESCO World Heritage site. It's best viewed from viewpoints accessible via footpaths, suitable for independent exploration. While the area is generally accessible, some pathways may have uneven surfaces. A visit can be enjoyed year-round, though winter may bring snow and ice, requiring appropriate footwear. Viewing the viaduct as a train crosses is a highlight, so checking train schedules is recommended. The visit itself is free, though train travel to Brusio and any associated costs for food or parking should be considered. Allow approximately 1-2 hours to fully appreciate the viaduct and its surroundings. Guided tours are not necessary as the location is easily explored on your own.