Visible below the waves are memorials to the city's Gold Rush dead.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

This glamorous old building is said to have inspired the Tower of Terror.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

The beauty of urban decay, hiding some dark secrets.

An extraordinary mixture of natural beauty and man-made phenomena.

An antiquated German apothecary on Chicago's North Side.

A colorful architectural gem in Seattle's uniquely modern Central Library.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

Despite the ever pressing encroachment of urban sprawl this grand New Orleans manse still stands.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

San Francisco's newly reopened hands-on science museum.

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

All that's left of the quintessential "cabin in the woods."

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

One of only two commuter aerial tramways in the United States.

A rare view of a preserved Victorian science museum.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.