ALT Snow-covered wooden shed against a forest of bare trees, with the sun rising in the background.

ALT Two docks jut out into ice-covered water under a sunrise that colors the ice pink and purple.

ALT A snow-covered boardwalk winds through a snowy forest. One part of the boardwalk juts out to the right, overlooking a barely visible river off-camera.

ALT A large deer with no antlers standing in a snowy forest.

ALT A bright red cardinal perches on a thin branch against a snowy background.

ALT A plump brown and white bird with a black-and-white striped head and yellow lores around its eyes sits on the snow.

ALT A snow-covered wooden sign with the Smithsonian Environmental Research Center logo, at the trailhead of a snowy forest path.

ALT A two-story laboratory building overlooks a snow-covered wetland with terraced pools.

ALT A wooden trailhead sign with the Smithsonian Environmental Research Center logo stands in front of a snow-covered forest. The top of the sign and its letters are lightly dusted in snow.

ALT An L-shaped building with gray siding and a light green roof sits beneath a blue sky, surrounded by trees. The words "Reed Education Center" are above the doorway.

ALT A wooden boardwalk stretches out into a green marsh. An octagonal overlook juts out to the left.

ALT A two-story silver lab building with long rows of windows sits in front of a forest. A silver sign sits in front, with the words “Charles McC. Mathias Laboratory.”

ALT A green boardwalk with wooden side rails plunges into a forest, with a white-flowering tree leaning over it on the left.

ALT Two women sit on a leaf-covered forest floor, attaching syringes to a scientific instrument with clear tubes.

ALT A young woman with long blonde hair stands in a wetland surrounded by tall brown and green reeds. She is wearing chest waders, holding one of the reeds and smiling at the camera.