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

These ruins are all that remain of what a Spanish barrack that likely housed a quarry overseer, masons, and stone cutters involved in the construction of the Castillo de San Marco.

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

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

The graves in Florida's oldest Black cemeteries are marked with shells, stones, and mementos of the deceased.

A bronze tribute to the everyday activists of St. Augustine's civil rights struggle

Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.

A market building entangled in St. Augustine's history of slavery and civil rights protest

A vestige from St. Augustine's First Spanish Period, built from native coquina rock

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

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

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

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

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

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

A towering, steel behemoth that has graced the skyline of Lakeland, Florida since the early 1980s.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

If you ever wanted to own an actual piece of Disney World, this is the place to shop.

The rounded structure has evolves from service station to citrus to souvenirs to Charley survivor.

The whole world is cooking in one Kissimmee parking lot.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

A centuries-old stone pagoda from Japan stands among cherry trees beside the National Mall Tidal Basin.

A unique shopping and dining park created from old shipping containers and filled with local businesses.