A beautiful geyser under environmental threat.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The first declared National Monument in the United States.

Shop selling 500 flavors of soda has something for everyone.

Hidden beneath the streets of London is a secret subway that only carried mail.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Dramatic river bend surrounds a natural red-rocked pedestal.

A 140-year-old castle with underground caves hidden in San Francisco.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A crumbling hospital from the 1850s on Roosevelt Island.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Rippling sand dunes frozen in the Arizona rock.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

An artsy hidden staircase leads to breathtaking views of San Francisco.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A terrific purveyor of natural history objects and curios.