ARCOSANTI Cross-pollinating principles of architecture and ecology, which visionary Paolo Soleri dubbed “arcology,” this live/ work campus with 50+ permanent residents is an experimental alternative to urban sprawl. Tours hourly. www.arcosanti.org. I-17 & Arcosanti Rd., Cordes Junction area, 928.632.7135. BIOSPHERE 2 Earth-systems research missions are conducted in a human-friendly, glass-enclosed microcosm that wows visitors with drastically changing temperatures, lush plant life, and tales from two human-lockdown experiments (1991-94). From Phoenix: I-10 east, Hwy. 387 east, Hwy. 79 southeast, Hwy. 77 northeast. www.b2science.org. 32540 S. Biosphere Rd., Oracle, 520.838.6200. SEDONA/OAK CREEK New-Agey retreat towns framed by hikable, photogenic red rocks. From Phoenix: I-17 north to Hwy. 179/exit 298, approximately 120 minutes.