Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Take a drunken tour inside the world's largest known geode.

The eccentric mansion of one of the most popular horror authors of modern times.

America's only nuclear missile silo open to the public.

Quite simply the largest tree in the world (by volume).

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

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

The only surviving prototype for Buckminster Fuller's house of the future.

World's largest Christmas store.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

A circus legend leaves an unexpected endowment.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.