Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

With 8,000 pipes this giant instrument is the most versatile theatre pipe organ ever built.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

A local dialect born in the late 19th century is only spoken in this isolated California valley.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

Regency-era excess on the English Coast.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

A sanctuary for sickly, stray, or wounded donkeys.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

One of the last surviving C-97s sits in a field in front of a Wisconsin inn.

This underground oasis is one of North America’s most fascinating prehistoric places—and you can scuba dive in it.

A bizarre house filled with an astounding array of collections.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Town of spiritualists and mediums in Florida.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

The palatial McDonald's that inspired Wesley Willis.

A lush green oasis in the middle of Chicago.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.