This modest post office sits on the site of H.H. Holmes' famous murder castle.

Ruins of a once-opulent grand Victorian resort.

Relics given to a Manhattan church to avoid seizure by the Italian government.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

Trash escaped from a landfill to fill beaches with all kinds of treasure.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

An annual festival celebrating Colorado's most famous frozen corpse.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

A vinyl-lover's Shangri-La.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

Mining town from the late 1890s, once home to Calamity Jane.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

Handmade treasures from around the world.

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

20,000 pieces in a Frank Gehry-designed building.

New fungal and bacterial species call this deadly lake home.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The haunting ruins of Jack London's dream house.

New York City's only preserved family home from the 19th century.

A bike being "eaten" by a tree is the real Vashon legend behind popular children's book, "Red Ranger Came Calling."

A world-class observatory in the California desert.