A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

The longest living non-clonal organisms on Earth.

A sparse, solitary sequoia still stands as a living tribute to the famous conservationist who planted it—but it's dying.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A medieval abbey featured on 'Game of Thrones' that dates back to the 12th-century.

The fifth-longest natural arch in the world, and the longest outside China.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

The legendary giant's severed hand sits on Antwerp's popular shopping street.

A man throwing a giant severed hand towers over Antwerp’s main square.

To enter this cluttered-yet-cozy sanctum of Belgian brews, ring the bell and tell the gatekeepers you've come “to taste beer.”

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

Even for Egyptian royalty, the afterlife was bring-your-own-beef.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

This diner's a kitschy dreamland for anyone whose heart is stuck in the 1980s.

The California capital city once stood 10 feet lower than it does today.

Four hundred granite steps were built into this massive rock by the National Park Service.

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