A deadly ancient portal to the underworld.

The atmospheric road was never meant to be so creepy.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Final resting place of the most prolific Fijian cannibal of all time.

The ancient latrines of the Greeks, in all their public glory.

The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

Medicinal spa created with the discharge from a geothermal energy plant.

A bizarre house filled with an astounding array of collections.

A small town Romanian cemetery filled with darkly humorous gravestones.

A heartbreaking monument showing the last morning in the life of Jane Griffith.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

Former estate of Lenin, now home to his death mask.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The unique ecosystem atop an Australian mountain is home to some colorful inhabitants.

Even King Tut was intrigued by the glass of the Great Sand Sea.

The final resting place of the great navigator, or maybe his brother.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

An Australian lake whose pink hue defies scientific explanation.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.