After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

See massive fossils that are over 200 million years old in northeastern Arizona.

An urban laboratory.

Ancient pueblos built into the base of a natural canyon wall.

A motel dedicated to Southwestern nostalgia.

The world's tallest statue of an American hero.

This racially troublesome eatery thought a new coat of paint could erase its offensive connotations.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

A collection of huge Pre-Colombian structures in Alabama.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

At 207 feet, one of the world's longest continuous escalators.

The final resting place for the remains of 143 Habsburg royalty.

Baroque celebration of the end of the Great Plague of Vienna.

Macabre astrological automaton clock dating to the late 1400s.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This bridge was constructed from the rubble of the infamous Bastille.

The curious underground history of keeping Paris clean.

France's most famous cemetery, with some of its most curious tombs.

These delicate sand pyramids look like naturally occurring gothic spires.

Europe’s oldest natural human mummy.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.