This black shoreline is made up of exploded lava particles.

Watch the newest land on the planet form before your eyes.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

The highway's southernmost spot is a beloved local attraction.

"We Seceded Where Others Failed."

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

A monument celebrating the idea of reaching inaccessible places.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

The freeway that never was.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

Sports history, made in the Arroyo Seco.

A decommissioned Naval base now rents itself out for people who want to blow stuff up.

Frank Lloyd Wright died a year before construction on his largest public project even began.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

A unique market that brings together various goods and cultures.

A pier that used to act as a busy ferry dock is now a decaying favorite of local fisherman and urban artists.

A historic fort commemorating the United States' naval history.

This giant temperature attraction created some giant electric bills.

The Giant Lemon of Lemon Grove.

The former Naval shipyard is open for exploring - mostly.