Get a privileged view over Mexico City's Historic Center from a terrace right in its heart.

These subterranean models show Mexico City's central square during three different eras.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

Where layer cakes tower above one’s head and there is never a shortage of icing.

This tiny, tucked-away eatery reflects the history of Mexico's Lebanese immigrants.

This one-window stand has been home to a giant vat of slowly simmering meats and an array of unique tacos for almost 50 years.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

This surreal-looking tree pruned more than 1,000 years ago is still producing olives for oil.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

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.

A Spanish town built into the cliffs.

Holding the current title of "biggest chair in the world," it stands with little fanfare in Lucena, Spain.

Moorish signal station on a stratgic rocky outcrop.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.