Serendipity Mercantile closed their doors in 2016. Sad! :(
Where: 635 Third Ave.
When: Monday-Saturday, 10am-6pm
Longmont has several large indoor flea markets around town, but Serendipity Mercantile is by far the most pleasurable shopping experience. Located in a historic building one block off of Main Street, part of its charm is the brick walls and the large windows.
Serendipity also offers a more curated collection of vintage and antique merchandise than its competitors (i.e., there's less crap to sift through). I love to browse their selection of antique and mid-century furniture, and if you like kitschy kitchenware, this is definitely the place. Serendipity also has a large selection of vintage clothing and jewelry (perfect for Halloween costumes).
In the back of the store, there is a small collection of vinyl (my husband's first and only stop) and a section of architectural salvage (old doors, shutters, and hardware). While much of the merchandise is pricy (these folks definitely know the worth of what they are selling), there are plenty of deals to be had as well.