This tower was once used to create ammunition for early settlers.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

This two-room shotgun shack in Tupelo is the birthplace of a King.

A cheeky alleyway window hosts tiny rotating exhibits with outsized charm.

The Old Mill shown in the opening credits of “Gone With the Wind” is actually fairly new, and was never a mill at all.

A restored, one-room African-American schoolhouse in the diva's hometown now preserves the legacy of its most famous student.

Elvis's own personal tropical hideaway.

An overgrown collection of miniature buildings still stand as evidence of one couple's obsession with The King.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

This striking art museum holds an amazing series of curiosity cabinets.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Ever wanted to can Spam?

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

The final resting place of the Hunkpapa Lakota leader Tatanka Iyotaka, commonly known by the English translation Sitting Bull.

The most loyal of little dogs, or a Victorian era publicity stunt?

A sweet symbol marks the place where torturous executions were once carried out.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

London's smallest police station is barely the size of a phone booth.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.