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

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A river runs through this remote valley in a very unexpected way.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

This interpretive path lets you get up close and personal with dinosaur bones.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The largest self-built castle in the U.S., six decades in the making.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

Volunteer-run library dedicated to exploring five decades of activism history.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

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

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

This iconic tattoo shop has its own onsite museum with artifacts from the early history of modern body art.

This state-of-the-art planetarium takes architectural inspiration from the sun itself.

Inside the Wayne County airport is an amazing collection of lights and sounds.

The secret skeleton of a murdered nun was discovered in this church basement, but the scandal doesn't end there.

One of the largest crucifixes in the world stands 55 feet tall in a secluded, wooded area of northern Michigan.

This 19th-century former train station’s unusual roof shape earned it a rather witchy name.

The former home is said to be haunted by the ghosts of the beloved mayor and his wife who lived here.