This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

Wild West history in Hollywood style.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

An extensive collection of ancient Egyptian artifacts and mummies.

Resting place of Hollywood's immortals is also site of summer film screenings.

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

The largest earthwork effigy in the world.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Yo, Adrian!

This elaborate towering structure was once famed for its revolutionary height.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

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

The oldest farmer's market in America is so ancient it was approved by the King of England.

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

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Dr Barnes' $25 billion private collection of art and arboretum.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Explore some of the most unique vehicles in history along with a cast of unsettling mannequins.