Now: A blinding swirl of singles bars, eateries, boutiques, spas, Union Street is one place where wealthy young people come to play, and sit in front of tablecloths beside longtime Marina residents. The sound of this area's nighttime merriment is distinctly (Cow) Hollow.
Then: Named for the area's incarnation in the 1800s as a pasture for grazing cattle. The Octagon House was built in 1861, and designed to let sunlight into every room.
How To Get There: The 22 Muni bus crosses Union Street near the end of its long trip down Fillmore Street. If you're already in the Marina, it is easy to jog over from Chestnut Street at Fillmore. You can also turn on to Union Street from Van Ness Avenue, and then try to park right away before the beginning of the commercial area at Gough Street.

Sidewalk on Union Street between Octavia and Laguna Streets

Fillmore Street at Union, looking north towards the bay

Union Street between Webster and Fillmore Streets

Union Street at Laguna Street

Pane e Vino Trattoria on Union Street at Gough

Amici's East Coast Pizzeria

Past Perfect Vintage and Antiques, on Union Street between Fillmore and Steiner

Rose's Cafe on Union Street at Steiner

Bistro Aix on Union Street

Eastside Westside Restaurant

Balboa Cafe on Fillmore Street at Greenwich Street

City Tavern on Fillmore at Greenwich

Real Food Company Market on Fillmore at Filbert

Vedanta Temple building on Webster Street at Fillmore in Cow Hollow

The Octagon House

The Octagon House Museum

Garden on the Octagon House grounds

Allyne Park, at Gough Street at Green Street, next to the Octagon House