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City of Trees: Washington, D.C. (Online Talk — Smithsonian Associates)

Online

On the eve of Arbor Day, naturalist and tree expert Melanie Choukas-Bradley presents an overview of the trees in our nation’s capital through stunning photographs of the Tidal Basin, U.S. Capitol, White House, National Arboretum, Rock Creek Park, and many other notable locations.

$25 – $30

Rock Creek Park: A Nature and History Walk (Guided Walk — Smithsonian Associates)

Peirce Mill at Rock Creek Park 2401 Tilden St NW, Washington

The walk begins near Peirce Mill, the historic and recently restored grist mill that celebrates the region’s agrarian past. Participants view the adjacent fish ladder that opened the spawning route for migrating shad and herring, dubbed the “herring highway.”

$55 – $75