One of the oldest living oak trees in the Southeast.

The second oldest continuously operating bar in Louisiana.

A snapshot of the city's fascinating voodoo culture.

The only surviving prototype for Buckminster Fuller's house of the future.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

The maritime museum that boasts the largest nautical library in the western hemisphere.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Tiny castle in the middle of the Rhine made you pay to pass.

An astounding collection of medical specimens, including bits of President Lincoln.