This award-winning men's bathroom was just too beautiful to not allow women to see.

The secret city built by the Manhattan Project.

One person's lost luggage is another person's treasure.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

One of the oldest living oak trees in the Southeast.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Railroad came. People came. Railroad left. Town died.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

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