The only building in Louisville (hopefully) that contains two ancient holy skeletons.

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This restaurant serves wood-fired fare served in a natural cave with a live spring.

Dedicated to a young woman who broke gender barriers at the University of Madrid.

A Kansas nature preserve protecting the plants and animals that once stretched across central North America.

People of the Plum Bayou culture built these enormous mounds over 1,000 years ago.

This arid landscape was once a lush wetland. Today, it's a paleontological site filled with fossilized mammoths, sabertooth cats, and more.

World's second largest particle accelerator, where nature reveals its secrets.

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

A subterranean haunt where wine and homemade biscottis are always on the menu.

Follow lines from a W.B. Yeats poem through interconnecting gardens designed to appeal to each of your senses.

Started as a kitchen garden, now the second largest botanical garden in the world.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

Nature and art meet in this curvy creation

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

What is it about mushrooms that makes people wish they lived inside of them?

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

Supposedly Satanic numbers adorn this preserved submarine sail.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

The longest navigable underground river in the United States is home to countless blind and albino animals.

One-layer pyramid in Indiana.

America's first public lending library began with a gift from Benjamin Franklin.