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

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

This small-town pizzeria won the Hollywood lottery.

Home to items never before seen by the public.

The "lovely red Vega" of the legendary record-settling pilot.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

The maritime museum that boasts the largest nautical library in the western hemisphere.

A maritime museum holding the remains of Blackbeard's pirate ship.

This famous city eluded concrete detection until the early 2000's.

A marvel of Byzantine engineering under the streets of Istanbul.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

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

The remains of the first saint from Alaska in the Russian Orthodox Church.

America's smallest "national forest" has only 33 trees.

Tropical paradise strewn with hundreds of World War II wrecks.

The ruins of a lighthouse on the island Amelia Earhart never reached.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

An isolated dive site teeming with cnidarians.

Giant money stones of Yap.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.