Enormous lake at the bottom of a unique cave system.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

This Arkansas town is known for its gangster history, its healing waters, and now its brews.

Home to items never before seen by the public.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

This little valley along Highway 1 is engulfed by thousands of lilies during the spring season.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

One of the smallest towns in the United States.

The first declared National Monument in the United States.

This old-world mansion with lush gardens is a gem in the heart of Silicon Valley.

The most beautiful Taco Bell in the world even has surfboard parking.

Furniture tries to escape an abandoned building in San Francisco.

Sitting atop San Francisco's tallest hill, a cross honors the victims of the Armenian genocide.

Inside this museum, the history of the Walt Disney Family empire is on full display.

A Hawaiian stairway to heaven—that you can't climb.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

This legendary urban waterfall creates a dazzling display of rainbows.

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

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

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

A beach made of semi-precious green sand on the Big Island of Hawai'i.

A tunnel of hardened lava along Maui’s famous Road to Hana.