The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

This giant green head remembers one of America's jazz giants.

An abandoned concrete jungle surrounded by a lush park.

A cave 150 feet beneath Kansas City is the perfect climate for growing 10,000 delicate orchids.

This mansion was made famous by its colorful cast of owners and location along the Sante Fe Trail.

This otherworldly church spire reaches up toward the heavens.

A remarkably opulent mansion with a tragic history.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

The now-serene site of the largest earthquake ever recorded in North America.

A suburban street in Anchorage doubles as a runway, and each home has its own airplane hangar.

Considered by many to be one of the most dangerous highways in Alaska.

Four-story concrete hotel never opened to customers.

A copy of the famous bus used during the filming of 'Into the Wild' is on display at an Alaska brewery.

This mile marker stands at the unofficial end of a highway built to defend the United States from a Japanese invasion during World War II.

This super-sized statue is the only public memorial to the deal that ended America's neutrality during World War II.

A trading post in the North Pole where children send letters.