And in Sherwood, Arkansas, the Country Club Flea Market stands as a monument to this particular brand of retail therapy.

At La Vaquita Flea Market in Pendergrass, Georgia, these moments of serendipity aren’t rare exceptions—they’re practically guaranteed in a wonderland of commerce that seems to stretch into infinity.

The Renaissance artist’s frescoes in Orvieto, Italy’s San Brizio Chapel comprise dynamic, monumental and fiercely realistic ...