Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.

A popular swimming hole that hides one of America's most deadly diving spots.

The tallest sea cliffs on the Southern Hemisphere are a climber's worst nightmare.

The deadliest diving spot in the world is also a stunning geological marvel.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

An emerald-green grotto just a short trip from Austin.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

A monument to the art of slicing people open.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Abandoned anti-ballistic missile base.

This serene oasis in an affluent Los Angeles neighborhood holds some of Gandhi's ashes and got Elvis into Eastern Philosophy.

Come crisp December nights, this fairly plain neighborhood becomes a holiday dream world.

A glittering South Asian anomaly in a wealthy Los Angeles suburb.

The final resting place of a space program monolith.

Mummified monks and the accidentally interred, in a 17th-century crypt.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

World-famous, Pink's still manages to keep its prized cult fetish status.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.