Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

This conservation area is also home to many of the region's desert tortoises.

A herd of 150 bison live on California's Santa Catalina Island and are at the heart of an ongoing debate between environmental protection and economic expansion.

In which a local geological marvel becomes a quaint roadside attraction.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

One of the largest Marian shrines on the West Coast stands rather unexpectedly in Silicon Valley.

Oldest building in California still in use.

Megachurch turned Catholic church comprised of 10,000 glass panes.

This golf ball–shaped former desert real estate office now houses a UFO museum.

A beautiful final resting place for some of the noteworthy deceased.

A giant donut stands as a popular symbol of Los Angeles iconography.

One of California's oldest continually used high schools has an interesting history, both on and off screen.

A "haunted" landmark on the coast of Southern California.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

Thousands of turbines whir at the origin of North American wind power.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

The unbelievably opulent home built for an infamous newspaperman.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.