These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A bizarre house filled with an astounding array of collections.

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

Enjoy classic musicals with a home-cooked meal at this former staple of American social life.

In a grove of fast growing walnut trees outside Paris, Illinois, a marker shares the story of a fictional road building culture.

This grave in a ghost town cemetery marks the death of a witch on a day that never happened.

This small-town park in southern Illinois has a 1,000,000-gallon swimming pool and a 100,000-barrel oil well.

An Art Deco gem that held together the artistic heart of an agricultural community for 92 years.

You were once able to challenge a chicken to tic-tac-toe at this park, which is now converted into the Aikman Wildlife Adventure.

One of the most powerful computers in the world can be visited by anyone who wants to experience more computing than they can handle.

An amazing collection of scale model ships.

A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Ruins of a Carnegie family mansion on Cumberland Island.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

An otherworldly musical haven in The Big Easy.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

This 19th-century Hamptons windmill was once home to modernist painter Agnes Pelton.

A 19th-century cabin built into a hollowed-out Sequoia tree.

It's easy to see why this eclectic architectural wonder has been dubbed the "Spaceship House."

This whimsical sculpture garden is a local treasure.

This supper-club-turned-concert-venue still serves drinks at its original rotating bar.