San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Over 315,000 preserved amphibians and reptiles in jars.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

The only road through the heart of Glacier National Park.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The site of Paul Revere's historic two lantern warning.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

This black shoreline is made up of exploded lava particles.

This former luxury resort in Kaua'i is now an abandoned relic.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Sports history, made in the Arroyo Seco.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

A massive volcanic plug is now a protected area that hosts a number of bird species.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

An old whaling station now serves to give the public a look at the commercial whaling industry, no longer a part of Monterey's economy.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

The oldest lighthouse on America's west coast no longer needs keepers, yet they maintain the site anyhow.