With a valid U.S. passport, you can stay up to 90 days for tourism or business during any 180-day period. Do not overstay! You must wait an additional 90 days before applying to re-enter the Schengen area. To stay longer than 90 days, you must have a visa.
Can I get residency in Spain if I own a house?
Yes, if you are a non-EU citizen, you can obtain a residence permit in Spain valid for 3 years as long as the property you purchase is valued at over €500,000. This residency is famously called golden visa, and comes with great advantages (which we will explore below).