Das Triest

A 1990s-era Sir Terence Conran–designed hideaway at the edge of baroque Karlsplatz, Das Triest is emblematic of the city’s no-frills, economic approach to environmentalism. A keycard system turns off electricity and climate control when guests are out (non-air-conditioned rooms are also available), and candles are recycled to reduce waste. The hotel hardly feels like an ashram, however: rooms are warmly modern, with big blocks of wood paneling and quirky touches like now-retro Philippe Starck lamps.