See massive fossils that are over 200 million years old in northeastern Arizona.

The only Florida state park with publicly accessible caves.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

Florida's first suspension bridge.

Where manatees are the snowbird vacationers in these balmy Florida springs.

The unique collection includes bronze cast handprints of some of America's most famous astronauts.

A building so large that it has its own weather.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.

An abandoned water sports stadium that has become a haven for graffiti and decay.

Former villa and estate of James Deering developed to preserve native tropical forests.

America's only city hall with minarets took architectural cues from Ali Baba and the Forty Thieves.

The timeworn "Yankee Stadium" of the fastest game in the world isn't going anywhere.

Where monkeys run wild and the humans are caged.

A mysterious castle built as a monument to lost love.

Dedicated to the victims of one of the deadliest hurricanes to strike the United States in recorded history.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

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

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

This tiny chapel next to a highway provides weary travelers a place to rest, pray, or maybe even get married.

From failed port town to Civil War fort, the ruins of this former defense saw their finest day in the television age.