This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

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

Art in the form of a winding, man made crack in stone.

A man-made island in scenic San Francisco Bay.

An enormous illuminated figure dances on the Las Vegas strip.

Mysterious stone tower featured in many alternative histories of the New World.

Cliffs that hold fossils, including the earliest known reptile, dating back more than 300 million years.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

Granting the right of way to ships over surface traffic since 1917.

Outsider art or homage to aliens?

This museum boasts the ninth-largest collection of insects in North America.

I Street Bridge is the heaviest swinging center bridge in the United States.

A downtown park built on top of unclaimed graves.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

A strange house built only at night, with rumored mystic inspiration.

A tiny survivor of the Donner Party disaster.

This graffiti-covered bridge is the quintessential vision of a place for disillusioned youth to escape the complexities of burgeoning adulthood.

Every president in history is immortalized in bronze in downtown Rapid City.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

The first declared National Monument in the United States.

The largest drain hole in the world.

This turn of the century masterpiece has a mysterious goaty interloper.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.