This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

A fairy tale castle in modern Rome.

Architectural monsters are devouring this palace's every door and window.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The underground sanctuary of a mysterious ancient cult.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Architectureal fantasy quarter of Rome.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Lonely minaret stump of a destroyed city.

Glacial lake that mysteriously empties itself every year.

A boulder carved into the shape of the cosmonaut's head.

Touching displays of wishes for peace from the Cold War era.

Where Stoddart and Connolly suffered in the infamous Bug Pit.

Looking for a unifying history, Uzbekistan finds its answer in a 14th Century Turco-Mongol conqueror... despite the fact he wasn't Uzbek.

Giant cauldrons overflow with Uzbekistan's favorite rice dish at this cavernous dining hall.

Beautiful palace stands tall over the Fergana Valley.

Final palace complex of the last of 29 Kokand rulers.

These "50 Fortresses" have been unearthed in the ancient oasis of Khwarezm.

This unique wooden mosque resembling a Chinese pagoda was said to be built without the use of nails.

Mysterious spherical rocks in the semi-desert of western Kazakhstan.

This Soviet statue is based on a piece of propaganda that's been elevated to national myth.