This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The remains of a 12th-century chapter house in Golden Gate Park.

The unbelievably opulent home built for an infamous newspaperman.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

A massive volcanic plug is now a protected area that hosts a number of bird species.

The final resting place of many of New Jersey's most famous residents, including U.S. history's most in-vogue antagonist, Aaron Burr.

The mysterious canine hides atop a drain pipe on the back of the building, some say as a sneaky shoutout to Yale.

A luxuriant botanical garden below sea level.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

After just one epic test blast, this literal loose cannon proved too explosive for combat.

This kitschy tavern is also home to rare early editions of "Treasure Island."

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

"X" marks the spot of an echo chamber in the middle of a plaza.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

One of the largest Native American shell middens stands 30 feet tall.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Gutted airplanes slowly decay in a Florida field.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

St. Augustine's record-setting narrow street was designed to protect against pirates.

A tribute to Ponce de Leon's supposed quest for eternal youth.