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

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

Offbeat arts organization that hosts exhibitions, events, and explorations.

Astonishing collection of helmets, scientific instruments, and medical models.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

From scholastic to sepulchral - now under reconstruction.

The loneliest island in New York.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Mansion and shopping center used in the 1975 film "The Stepford Wives."

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

A crumbling hospital from the 1850s on Roosevelt Island.

New York's oldest magic store.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A good place to research the Freemasons, esoterica, occultism, and hermeticism.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

Harlem park dedicated to compulsive hoarders killed by their own junk.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Historic Greenpoint theater, turned roller disco, now housing a chain pharmacy store.

Phil Mortillaro uses keys to bring art back to the Village.