Tunnel Tops’s embankment is studded with native coastal scrub species such as sagebrush (Artemisia tridentata) and purple self-heal flowers (Prunella vulgaris), as well as drought-tolerant, nonnative trees and shrubs. Nearly two miles of wide, curving paths meander through the gardens past iconic Golden Gate views, from colonial buildings and a public transit stop at the top of the slope to a playground and the Bay shoreline at the bottom.