The famous 1990s sealed-ecosystem experiment, now a University of Arizona science campus you can walk through. Self-guided tours pass a caged rainforest, an artificial ocean, and the eerie underground 'lung' that once kept the whole world breathing.
57 hand-picked things to do in Tucson, United States — 14 completely free — each with a real address, price, hours, and an insider tip. Updated July 2026.
Mission San Xavier del Bac, Tumamoc Hill Sunset Climb, St. Augustine Cathedral are among the 14 completely free activities in our Tucson list. Each entry includes the address, hours, and an insider tip.
Our 57 hand-picked Tucson activities range from free up to about $290 per person, with most under $25. Use the Free / Budget toggle on the deck to deal within your price range.
Every activity is a real, verified place or experience with a current price, address, and opening hours — hand-picked for travelers and locals. Last updated July 2026.
Aguascalientes
Albuquerque
Brampton