Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Dramatic river bend surrounds a natural red-rocked pedestal.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Peace Park and the Atomic Bomb Dome.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

World's largest collection of serial killer artwork and other macabre exhibits.

A semi-scholarly approach to sex.

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

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

The ancient tomb acts as a calendar that keeps perfect time.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

Tubing through a cave lit with glowworms is a magical underground experience.

A toxic ghost town sitting atop a massive coal fire.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The monument dedicated to Phineas Gage in the town where his accident happened.

A museum dedicated to "science, history and the arts" little changed since 1915.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.