A former major munitions plant that has been converted into a sprawling art space.

An original apothecary from 1792.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A cement mixer-turned-kaleidoscope in downtown Norfolk offers different views of the city.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

The once-abandoned 140-year-old hotel used in the movie "In Dreams."

One of 100 “Whaling Wall" murals painted in 13 different countries by a renowned marine life artist.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

The world's longest known cave system.

Rare recess caves fill this unbelievably beautiful Ohio park.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

Inside, ancient treasures. Outside, modern contradictions.

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

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

This magnificent Cincinnati graveyard is also a popular public park.

An abandoned relic of the city's failed experiment with below ground transit.

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

An art deco ice cream shop covered in vintage train station tiles.

Hidden on two floors of downtown building, the library has an incredible deal on rent.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.