The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

Reforestation in action is the main attraction in this abandoned quarry.

100 massive sculptures in the Hudson River Valley.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

The mayor made the declaration in 2004.

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

A black cottonwood gets a second life as a home for books.

A crumbling cliffside ruin hidden in the woods.

A collection of colorful dinosaurs hidden in an actual rainforest.

Internationally-recognized arts center housed in a century-old former military barracks.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

A psychedelic labyrinth on the San Francisco bay.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

A speck of nature and art in one of San Francisco’s most notorious neighborhoods.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

A playing field for a popular French past time can be found tucked away in a quiet corner of Golden Gate Park.

A miniature view of the park, caught in time.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

This Elizabethan hedge maze is one of only six in North America.