Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Huge stone depressions which may have acted as an Incan agricultural experiment.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

Some of the best Chinese-Vietnamese fusion can be found at outposts of this homegrown empire.

Giant heads occasionally litter the industrial Houston neighborhood where sculptor David Adickes has his studio.

The largest underground pedestrian tunnel system in the U.S. mostly caters to the people working in the offices above, but provides a great, air-conditioned way to traverse the city.

Once seen as a bit of an eyesore, this sculpture has become a staple of downtown Houston.

At the "Garage Mahal" in Houston, car culture is about more than just driving.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

A beautiful botanical garden in the heart of the Natural State.

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

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

A pharmacy built in the shape of a mortar and pestle, now resembles a fancy cocktail.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This effigy was crafted to annoy a neighbor after a civil dispute over a foul smell.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A sweet symbol marks the place where torturous executions were once carried out.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The colorful stairs are made with marble from the world's major quarries.

Some believe that the stone once used to coronate Scottish kings resides inside this bar.