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

One New Hampshire alleyway has become home to a public gallery of feline art.

This massive mushroom has spent centuries eating its way across a huge swath of Oregon.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

This dilapidated ship carcass covered in trees is a striking sight.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.

Arcadia is home to a haven for nature geeks and 80s TV lovers alike.

Find out what it sounds like when doves cry at Prince's recording studio estate turned museum.

A Tucson museum and performance space full of found-object movable sculptures.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

When it opened during the final years of the embargo, all the drinks and cigars were free.

A vertically floating hemlock controls the waves and weather at Crater Lake.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

Three hundred years of preserved Spanish colonial history in San Antonio.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

Come for the sustainable organic chocolate, stay for the sustainable organic booze.

An annual extravaganza of Broadway theater memorabilia.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

Mine your own precious stones.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.