Math Horizons

Math Horizons is a magazine aimed at undergraduates interested in mathematics, published by the Mathematical [Association of America]. It publishes expository articles about "beautiful mathematics" as well as articles about the culture of mathematics covering mathematical people, institutions, humor, games, cartoons, and book reviews.
The MAA gives the Trevor [Evans Award]s annually to "authors of exceptional articles that are accessible to undergraduates" that are published in Math Horizons.