This sign designates the road that leads to the infamous Area 51.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

A Prada store in the West Texas desert that is never open for business.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

Alexander Hamilton’s creation caused quite a bit of controversy.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

In the early 1800s, surgery was also a show.

World's first "penitentiary," meant to be humane, drove men insane.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A layered tribute to the work of mosaicist Isaiah Zagar.

Furniture tries to escape an abandoned building in San Francisco.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

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

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

This private residence was the template for one of the most beloved television homes of all time.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Tiki luxury on Nob Hill.

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