Community bookshelf of 25-foot-tall book spines.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

Sitting atop San Francisco's tallest hill, a cross honors the victims of the Armenian genocide.

This Alamo Square mansion is rumored to have hosted satanic rituals and other occult practices.

A modest reminder of treacherous waters at the Golden Gate.

This contorting sculpture is the tallest in San Francisco.

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

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

Colorful boxes placed over the dead are left to rot and crumble.

The now-serene site of the largest earthquake ever recorded in North America.

A suburban street in Anchorage doubles as a runway, and each home has its own airplane hangar.

Considered by many to be one of the most dangerous highways in Alaska.

Largest Roman Catholic church in North America.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

After James Madison's death, his wife and former First Lady Dolley Madison lived in this yellow building near the White House.

This Masonic lodge was the first major private building to be constructed in Washington, D.C. after the Civil War.

There’s a special club house at the top for the bell ringers.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A downtown park built on top of unclaimed graves.

In a dry, neglected cemetery lies the unassuming grave of a soldier vilified in life but celebrated in death.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.