Symbolic attempt to overcome the issues of life.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

If astronomy had a ghost, it would look like this observatory.

The longest navigable underground river in the United States is home to countless blind and albino animals.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

The competition: breathe deeply as long as you can.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

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

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Slyly buy a shake in the Parker Meridien lobby.

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 mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

An artist's cute bronze subway sculptures belie his violent artistic past.

Visit the monolithic tomb of America's most famous general.

Elevated freight railway turned wildly successful urban park.

A terrific purveyor of natural history objects and curios.

Tucked in the back of this amazing antique store is an important piece of medical history.