Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Monasteries on rock pillars, once accessible only by frayed ropes.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Breathtaking and huge 430 year old maps of Italy.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

"There's nothing there," and other lies the KGB told us.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

The walls of the iconic dome are hollow and have a secret stairway.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

The site of the climactic scene from the classic horror film is now a historic landmark.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

A man-made island in scenic San Francisco Bay.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

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

One of the most elaborate displays of Jellyfish is on display at the aquarium.