Unfortunately another postcard with very little information about what the picture is of. The sender mentions on the back that is modernism art. Gaudí is presumably Antoni Gaudí, a Spanish architect, and I'm assuming this fountain is from one of his buildings. If you know more, let me know in the comments!
On the back:
Dear Jennifer! Hi! How are you? Fine I hope so! I'm Lluna a Spanish woman who lives in Barcelona city. And here I sent you a pic of our modernism art. Hope you like it. Saludos desde España.
LlunaMy rudimentary Spanish (the benefits of working in a heavily multilingual office!) tells me that the Spanish sign-off means "greetings from Spain".
There are two stamps: one is a stamp commemorating renewable energy and depicting the process of creating geothermal energy in a colourful diagram (yes, really). The other is of an unnamed dude, who looks vaguely familiar but I'm not sure who he is.