Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

This functioning mill was built in the 1970s using parts from several other West Virginia mills.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

A unique sculpture park that specializes in the huge and bizarre.

10,500 square feet of pinball housed in former dollar store and home to the last playable "Thunderball."

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

An overgrown collection of miniature buildings still stand as evidence of one couple's obsession with The King.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.

Step into Monet's world at this fine-dining restaurant in the middle of a New Jersey sculpture park.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

One Pittsburgh musician's decades-in-the-making memorabilia collection is on display at this rock-n-roll curio shop.

A surprising museum of 20th-century technology.

This environmental engineering marvel keeps salt water from the Elizabeth River.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

Nothing says indulgence like a 1,500-pound chocolate castle.

A giant ball made from pieces of an old Jeep.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.