Horseshoe Basin, in the Pasayten Wilderness is one of the few places in the lower 48 states where you can find wide expanses of tundra. In July when the snow has just melted the basin is alive with myriad wildflowers sprouting out of the grass as far as you can see.
This first image is from the trail junction where the trail from Iron Gate meets the Boundary Trail (also known as the Pacific Northwest Trail).

As you progress westward on the PNT through the glory of Horseshoe Basin you will soon encounter Louden Lake. If you visit here in the fall the lake is little more than a small mud pond, but in early summer the wide flat lake provides ideal reflective qualities! And hordes of mosquitoes!