Living fossils in this remote Australian bay provide a glimpse of what Earth may have looked like 3.5 billion years ago.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

This abandoned radar site is slowly being taken back by the jungle, its mission cut short by the end of the Cold War.

This jail once controlled by the Japanese military now sits abandoned on a remote Pacific island.

In ancient times, these fallen standing stones supported a massive house.

The pits used to load the nuclear bombs onto the aircraft that dropped them over Hiroshima and Nagasaki at the end of World War II.

A World War II battle site made famous by one man's heroic actions.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

These enigmatic ruins continue to vex archaeologists.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

An important Mayan religious and trading center dating back to 200 BC.

A massive underwater sinkhole made famous by Jacques Cousteau.

An intentionally grounded cargo ship remains half-buried in the sand.

Disused penal colony features prisoner artwork, some sketched in human blood.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

Sloth rehabilitation center in the jungle of Costa Rica.

The California secessionist movement has its own foreign embassy, in Russia of all places.

One of the world's tallest statues is also one of its most hated.

Home of the future Emperors of Russia.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Back in the tiny USSR.

Its front wall is striped with a menagerie of fantastic beasts and magnificent monsters.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.