Sound travels strangely in this underground whispering gallery.

These ancient artifacts are a testament to the enduring significance of the bull in Spanish culture.

The house where the writer spent his formative years.

An enormous roadside attraction in the heart of Spain's toy-making hub.

A replica of the ice houses that once formed the basis of a local ice cream industry sits proudly in the middle of traffic.

This stunning and ethereal mural symbolizes the beauty, unity, and diversity of humankind.

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

This haunting sculpture was created as a statement on the mechanized warfare of the First World War.

A small town celebrates its cash crop with a giant highway sculpture.

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

This nondescript building hides an entrance to an underground nuclear tunnel system.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

Fragments of human bones are embedded in the walls of this quaint alley.

This abandoned viewing platform has become a monument to unnecessary government spending.

Legends surround this natural rock formation that looks like a Moorish king wearing a crown.

Stockholm's narrowest alley is barely over two feet wide.

This centuries-old rooster survived a devastating fire.

A wooden street sign is the last remnant of this 400-year-old alleyway.

This magnificently macabre shield shows the power of chivalrous love in medieval times.

This interactive museum highlights the history and philosophy of one of the world's most difficult sailing races.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

This museum houses two of Mexico's most impressive Aztec monoliths.