Relics of the 1894 Midwinter Exposition continue to delight visitors today.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

The mysterious round rocks of Schooner Gulch.

This whimsical seashell-shaped place of worship was designed to blend into its surroundings.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

A shining, cold, black organ lies in San Francisco's financial district.

A sharp sculpture made of thousands of pieces of jagged glass.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Eighteen miniature death-scene dioramas.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

The miraculous hydrant that saved the Mission District in 1906.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A hidden subterranean installation offers a view of the sky.

Art in the form of a winding, man made crack in stone.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.