6 Man-made Structures- Other to explore in San Francisco County
Cultural, commercial, and financial center of Northern California.
The Exploratorium is a museum of science, technology, and arts in San Francisco. A huge number of diverse exhibits, and many with hand-on learning experiences. This is the only place in San Francisco where visitors can touch, tinker and play with more than 650 hands-on exhibits.
Lombard Street is an east-west street in San Francisco, California that is famous for a steep, one-block section with eight hairpin turns. Stretching from The Presidio east to The Embarcadero. The famous one-block section claimed to be "the most crooked street in the world", is located along the eastern segment in the Russian Hill neighborhood. It is a major tourist attraction.
This is a monumental structure originally constructed for the 1915 Panama-Pacific Exposition in order to exhibit works of art presented there. Situated in the Marina District of San Francisco, California. In addition to hosting art exhibitions, it remains a popular attraction for tourists and locals.