One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A sulfuric hellscape in southern Italy.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

The West's first incursion into the Afghan world lies buried beneath a military base.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

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

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The prototype for all Nazi concentration camps.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The fairy tale castle of the "fairy-tale king."

A small but immensely extravagant palace built by the "Night King."

World's largest barrel containing an inn.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This record setting conveyor belt system can even be seen from space.

2300-year-old Roman road connecting the empire.

The world's largest military aircraft cemetery.