About 80% of all U.S. avocados are descendants of Rudolph Hass's glorious tree.

Working mining and drilling equipment demonstrate 150 years of energy history.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

Ancient Greek oracle of the dead.

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

This centuries-old pueblo church houses the body of a Franciscan friar who is said to be a rare "incorruptible" corpse.