The world’s largest underground marble quarry is hiding in Vermont.

Two distinctive homes on a New England village green look like a couple of frosted wedding cakes.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

This cavernous abandoned marble mine is popular with ice skaters in the winter.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

A cement mixer-turned-kaleidoscope in downtown Norfolk offers different views of the city.

The FBI's urban training course may have the highest fake crime rate in the world.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

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.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

This sculpture gallery is home to magnificent beasts made of scrap metal and found objects.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This downtown Dallas art installation is always on the lookout.

Mysterious stone tower featured in many alternative histories of the New World.

The vaguely man-shaped root that ate the body of the founder of Rhode Island.

The Lowcountry color with the power to stop evil from entering a home.