The charred, dead skeleton of an oak tree is said to have consoled a dying 16th-century Italian poet.

One of Rome's most picturesque and original bridges was also a popular choice for Grand Tour artists.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This is the oldest Roman-made bridge in the city still existing in its original state.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This curious, round temple is the oldest still-standing marble building in Rome.

This ancient market is often referred to as the oldest shopping mall in the world.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

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

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

This postmodern apartment block was designed to be a vertical neighborhood.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This lucky bronze frog was gifted to Madrid by a casino.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

The earliest known map to show America, discovered by accident at a Paris bookshop.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Commonly acknowledged as the only public monument to the Devil himself.

An ancient Egyptian temple in the middle of Madrid, Spain.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

The stunning interior of this Gothic church is covered in ornate gold details.