Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

Once disputed as the largest sundial in the world.

An urban laboratory.

Once a year, at exactly 11:11 a.m., this monument comes to life.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

The final resting place for an internet icon.

A giant mascot, a car bomb, and the mafia mingle in the history of a defunct restaurant chain.

A lingering bit of Space Race nostalgia lies in the middle of the desert.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

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

This shrine commemorates the site of the first known Catholic mass in the United States.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

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

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

It's a pretty creepy lock-up.

The site of Martin Luther King Jr.'s arrest as he attempted to have lunch.

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

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

Built around 1723, this is the oldest surviving home in the U.S.'s oldest colonial city.

One of the oldest, tallest, and most haunted lighthouses in America.

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

The Gulf’s longest fishing pier is a year-round paradise for catch-and-release whoppers.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.