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

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

Part of a highway network meant to connect Miami to Montreal, this 10-mile stretch of road made from red bricks is still around 100 years later.

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

Built in 1931, this small passageway is believed to be the first modern skyway.

The titular fictional logger only inhabits this otherwise historically focussed museum via a piece of fiberglass kitsch.

As the glaciers retreated out of northern Wisconsin, this unique natural wonder was crafted.

Dakota legend claims this locally iconic pinnacle was once part of a sacred burial site that was cleaved in two.

This secret gem of a toy store houses a rideable carousel populated with fantasy animals.

This water tower has been a staple of the Rochester skyline since 1931.

This monument claims to display the first pot used to cook a famed Southern stew.

A statue honoring 44 continuous years of greeting passing ships.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

A modest walled graveyard where nobody is actually buried.

Georgia's first brewery is also one of its oldest surviving buildings.

The ruins of an open-air theater built on this Georgia island in the 1970s.

Location of a reliquary containing bone fragments of 18 saints.

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

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

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

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.

Only through the lens of a microscope can visitors see the true treasures inside this museum.