Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

A melancholy jester sits on the grave of a famous 20th-century ballet dancer and choreographer.

The original place where water met land in the City by the Bay is outlined in brass.

Gold Rush-era tombstones line the park's paths.

A former hardware store near Yerba Buena is the official home of California's history.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The miraculous hydrant that saved the Mission District in 1906.

The first AIDS memorial chapel in San Francisco and one of only a few in the U.S.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

A museum befitting the city responsible for supplying the majority of the world's LSD.

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

Half of a house.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

This antique shop specializes in the history of print and design.

This 19th-century church is now a popular roller rink.

A magnificent work of architecture designed to honor a former military leader.

A hollow cement depiction of time's inexorable effect on the human body.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

An avant garde art museum at the University of Chicago.