This 19th century train workshop is a treasure trove of railroad history.

The California capital city once stood 10 feet lower than it does today.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Single runway interrupted by a busy road that cuts across its middle.

A trading post in the North Pole where children send letters.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

This historic Victorian hotel has a scandalous history of affairs and murder.

The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

The world's most elegant power lines.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

The most confusing clock in New York.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Visit the monolithic tomb of America's most famous general.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.