Golden Gate Park's historic collection of plants.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

This grinning pup statue is all that's left of what was once a ubiquitous Bay Area diner chain.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

Outside San Francisco lies a small clown cemetery and memorial.

A vast city of the dead, where the deceased outnumber the living by more than a million.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

The final resting place of the Emperor of the United States and Protector of Mexico.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

The world's longest known cave system.

Mile-long cave system near Great Smoky Mountains.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

In the hometown of the Grand Ole Opry star is a larger-than-life memorial statue made entirely from chicken wire.

This two-room shotgun shack in Tupelo is the birthplace of a King.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

A restored, one-room African-American schoolhouse in the diva's hometown now preserves the legacy of its most famous student.

Elvis's own personal tropical hideaway.

Walk the whole Mississippi River!

Home to drunken tower-climbing goats... seriously.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.