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

A vast city of the dead, where the deceased outnumber the living by more than a million.

The rusting remains of the largest assembled WWII fleet on the West Coast.

A man-made island in scenic San Francisco Bay.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

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

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

San Francisco's newly reopened hands-on science museum.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The arch that celebrated the completion of the Lincoln and Victory highways.

This beloved roadside attraction welcomes visitors with his signature neon smile.

Bill Murray bowled three straight strikes here at Reno's "Taj Mahal of Tenpins."

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

Electrical pylon in the shape of Disney's beloved mouse.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

A true treehouse near Hawai'i Volcanoes National Park.

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

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

This black shoreline is made up of exploded lava particles.

This legendary urban waterfall creates a dazzling display of rainbows.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

These ancient sacred grounds granted amnesty to those who managed to reach them.