New York's oldest and possibly grandest keeper of books.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Concrete strongholds stand guard over the Golden Gate.

This (occupied) house is 10 feet wide and full of spite.

A 300-ship graveyard, with a few still visible at low tide.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

The Flatiron Building's storied West Coast cousin is a lot more into religion.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

Golden Gate Park's historic collection of plants.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

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

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

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

A rough granite monument marks the spot where Europeans first caught sight of the San Francisco Bay.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

Curios, scientific antiques, oddities for sale.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

Some of the saint's blood and bones are said to reside in Dublin.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.