Take a guided tour of the once-extravagant, now-decaying Hotel Eden, built in 1897, where the guest list has included Albert Einstein, the duke of Savoy and several Argentine presidents. You can also wander around by yourself; the signs are in Spanish and English. The nocturnal tours (AR$100) at 10pm on Saturdays are meant to scare the wits out of you.
Hotel Eden
Córdoba & the Central Sierras