The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The oldest Dutch colonial stone house in New York City is a hidden gem on the border of Brooklyn and Queens.

This small and serene place for quiet reflection on Staten Island was built in China based on the gardens of the Ming Dynasty.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A beloved carnival gets a modern makeover in Los Angeles.

The evolution of recreational vehicles and motorhomes is on display in the “RV capital of the world."

This lovely public park has an intriguing past and unique wooden bridges made of concrete.

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

Obscure Freemasons still live in D.C.’s largest private residence.

More than five miles of underground passageways.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

Mile-long cave system near Great Smoky Mountains.

Enormous lake at the bottom of a unique cave system.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Colorful Native American paintings are hidden within this small cavern.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

The fossilized remains of ancient California redwoods.